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J. Hallas · SciRah

Researcher profile · Semantic Scholar

J. Hallas

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J. Hallas — researcher profile on SciRah

h-index: 67
Works: 568
Citations: 21K

Most-cited papers

Arterial events, venous thromboembolism, thrombocytopenia, and bleeding after vaccination with Oxford-AstraZeneca ChAdOx1-S in Denmark and Norway: population based cohort study
A. Pottegård, L. Lund, Ø. Karlstad, Jesper Dahl +12 more
2021British medical journal371 citations Open access
Semantic Scholar
Long-term cardiovascular safety of febuxostat compared with allopurinol in patients with gout (FAST): a multicentre, prospective, randomised, open-label, non-inferiority trial.
I. Mackenzie, I. Ford, G. Nuki, J. Hallas +10 more
2020The Lancet262 citations Open access
Semantic Scholar
Post-acute effects of SARS-CoV-2 infection in individuals not requiring hospital admission: a Danish population-based cohort study
L. Lund, J. Hallas, Henrik Nielsen, A. Koch +5 more
2021Lancet. Infectious Diseases (Print)203 citations Open access
Semantic Scholar
University of Southern Denmark Characteristics and predictors of hospitalization and death in the first 11 122 cases with a positive RT-PCR test for SARS-CoV-2 in Denmark a nationwide cohort
Mette Reilev, K. Kristensen, A. Pottegård, L. Lund +14 more
2020170 citations
Semantic Scholar
Reproducibility of real-world evidence studies using clinical practice data to inform regulatory and coverage decisions
Shirley V. Wang, S. K. Sreedhara, S. Schneeweiss, J. Franklin +67 more
2022Nature Communications100 citations Open access
Semantic Scholar
Control yourself: ISPE‐endorsed guidance in the application of self‐controlled study designs in pharmacoepidemiology
S. Cadarette, M. Maclure, J. A. Chris Delaney, H. Whitaker +6 more
2021Pharmacoepidemiology and Drug Safety74 citations Open access
Semantic Scholar
Adverse Outcomes and Mortality in Users of Non-Steroidal Anti-Inflammatory Drugs tested positive for SARS-CoV-2: A Danish Nationwide Cohort Study
L. Lund, K. Kristensen, Mette Reilev, S. Christensen +7 more
2020medRxiv65 citations Open access
Semantic Scholar
Association of Potent and Very Potent Topical Corticosteroids and the Risk of Osteoporosis and Major Osteoporotic Fractures.
A. Egeberg, P. Schwarz, T. Harsløf, Y. Andersen +3 more
2021JAMA dermatology63 citations Open access
Semantic Scholar
Sodium–glucose cotransporter 2 inhibitors and risk of nephrolithiasis
K. Kristensen, D. Henriksen, J. Hallas, A. Pottegård +1 more
2021Diabetologia51 citations Open access
Semantic Scholar
Use of low‐dose quetiapine increases the risk of major adverse cardiovascular events: results from a nationwide active comparator‐controlled cohort study
M. Højlund, K. Andersen, M. Ernst, C. Correll +1 more
2022World Psychiatry47 citations Open access
Semantic Scholar
Risk and course of SARS-CoV-2 infection in patients treated for hypothyroidism and hyperthyroidism
T. Brix, L. Hegedüs, J. Hallas, L. Lund
2021The Lancet Diabetes and Endocrinology46 citations Open access
Semantic Scholar
Discontinuation of oral anticoagulation in atrial fibrillation and risk of ischaemic stroke
L. A. García Rodríguez, L. Cea Soriano, Stine Munk Hald, J. Hallas +5 more
2020Heart40 citations Open access
Semantic Scholar
Who prescribes drugs to patients: A Danish register‐based study
A. Pottegård, M. Olesen, B. Christensen, M. Christensen +2 more
2021British Journal of Clinical Pharmacology37 citations Open access
Semantic Scholar
Trends in Incidence of Intracerebral Hemorrhage and Association With Antithrombotic Drug Use in Denmark, 2005-2018
S. Hald, Sören Möller, L. A. García Rodríguez, R. Salman +6 more
2021JAMA Network Open37 citations Open access
Semantic Scholar
Evaluating the use of prescription sequence symmetry analysis as a pharmacovigilance tool: A scoping review.
E. Morris, Josef Hollmann, Ann-Kathrin Hofer, Hemita Bhagwandass +4 more
2021Research in Social and Administrative Pharmacy35 citations
Semantic Scholar
Sodium‐glucose cotransporter‐2 inhibitors and the risk of gout: A Danish population based cohort study and symmetry analysis
L. Lund, M. Højlund, D. Henriksen, J. Hallas +1 more
2021Pharmacoepidemiology and Drug Safety35 citations Open access
Semantic Scholar
Trends in the use of oral anticoagulants, antiplatelets and statins in four European countries: a population-based study
L. A. García Rodríguez, L. Cea Soriano, F. D. de Abajo, F. Valent +7 more
2021European Journal of Clinical Pharmacology33 citations Open access
Semantic Scholar
Persistence and adherence to non-vitamin K antagonist oral anticoagulant treatment in patients with atrial fibrillation across five Western European countries
J. Komen, A. Pottegård, A. Mantel-Teeuwisse, T. Forslund +14 more
2021Europace33 citations Open access
Semantic Scholar
Use of benzodiazepines and benzodiazepine‐related drugs in the Nordic countries between 2000 and 2020
M. Højlund, L. Gudmundsson, J. H. Andersen, L. Saastamoinen +5 more
2022Basic & Clinical Pharmacology & Toxicology32 citations Open access
Semantic Scholar
The effect of immunosuppressants on the prognosis of SARS-CoV-2 infection
D. Ward, S. Gørtz, Martin Thomson Ernst, N. N. Andersen +8 more
2021European Respiratory Journal32 citations Open access
Semantic Scholar
The Validity of Danish Prescription Data to Measure Use of Aspirin and Other Non-Steroidal Anti-Inflammatory Drugs and Quantification of Bias Due to Non-Prescription Drug Use
Natascha Gaster, J. Hallas, A. Pottegård, S. Friis +1 more
2021Clinical Epidemiology32 citations Open access
Semantic Scholar
Comparative effectiveness of heterologous third dose vaccine schedules against severe covid-19 during omicron predominance in Nordic countries: population based cohort analyses
N. Andersson, E. M. Thiesson, U. Baum, N. Pihlström +14 more
2023British medical journal28 citations Open access
Semantic Scholar
Congenital Malformations in Denmark: Considerations for the Use of Danish Health Care Registries
A. Broe, P. Damkier, A. Pottegård, J. Hallas +1 more
2020Clinical Epidemiology28 citations Open access
Semantic Scholar
Non-vitamin K antagonist oral anticoagulants, proton pump inhibitors and gastrointestinal bleeds
J. Komen, A. Pottegård, P. Hjemdahl, A. Mantel-Teeuwisse +7 more
2021Heart27 citations Open access
Semantic Scholar
The Use of active Comparators in self-controlled Designs.
J. Hallas, H. Whitaker, J. A. Chris Delaney, S. Cadarette +2 more
2021American Journal of Epidemiology27 citations Open access
Semantic Scholar
Major Cardiovascular Events After Spontaneous Intracerebral Hemorrhage by Hematoma Location
Nils Jensen Boe, S. Hald, Mie Micheelsen Jensen, L. Kristensen +10 more
2023JAMA Network Open26 citations Open access
Semantic Scholar
Association of Prior Intracerebral Hemorrhage With Major Adverse Cardiovascular Events
D. Gaist, S. Hald, L. A. García Rodríguez, A. Clausen +3 more
2022JAMA Network Open24 citations Open access
Semantic Scholar
Development and Validation of a Nordic Multimorbidity Index Based on Hospital Diagnoses and Filled Prescriptions
K. Kristensen, L. Lund, P. B. Jensen, A. Broe +14 more
2022Clinical Epidemiology22 citations Open access
Semantic Scholar
Long-Term Risk of Skin Cancer and Lymphoma in Users of Topical Tacrolimus and Pimecrolimus: Final Results from the Extension of the Cohort Study Protopic Joint European Longitudinal Lymphoma and Skin Cancer Evaluation (JOELLE)
A. Arana, A. Pottegård, J. Kuiper, H. Booth +14 more
2021Clinical Epidemiology22 citations Open access
Semantic Scholar
Epidural Analgesia and Recurrence after Colorectal Cancer Surgery: A Danish Retrospective Registry-based Cohort Study
R. Hasselager, J. Hallas, I. Gögenur
2022Anesthesiology20 citations Open access
Semantic Scholar
Development and Validation of a Nordic Multimorbidity Index Based on Hospital Diagnoses and Filled Prescriptions
K. Kristensen, L. Lund, P. B. Jensen, A. Broe +14 more
202219 citations
Semantic Scholar
Cox regression using a calendar time scale was unbiased in simulations of COVID-19 vaccine effectiveness & safety
L. Lund, H. Støvring, A. Pottegård, M. Andersen +1 more
2023Journal of Clinical Epidemiology18 citations Open access
Semantic Scholar
Lithium and the risk of chronic kidney disease: A population‐based case–control study
M. Højlund, J. S. Winkel, M. Nybo, J. Hallas +2 more
2022Basic & Clinical Pharmacology & Toxicology17 citations Open access
Semantic Scholar
Long‐term oral budesonide treatment and risk of osteoporotic fractures in patients with microscopic colitis
Mette Reilev, J. Hallas, Martin Thomsen Ernst, G. Nielsen +1 more
2020Alimentary Pharmacology and Therapeutics17 citations Open access
Semantic Scholar
Association of Low-Dose Quetiapine and Diabetes
M. Højlund, L. Lund, K. Andersen, C. Correll +1 more
2021JAMA Network Open16 citations Open access
Semantic Scholar
Impact of low‐dose quetiapine‐use on glycosylated hemoglobin, triglyceride and cholesterol levels
M. Højlund, H. Støvring, K. Andersen, C. Correll +1 more
2022Acta Psychiatrica Scandinavica15 citations Open access
Semantic Scholar
Identifying diabetogenic drugs using real world health care databases: A Danish and Australian symmetry analysis
L. Lund, Patricia Hjorslev Jensen, A. Pottegård, M. Andersen +2 more
2023Diabetes, obesity and metabolism13 citations Open access
Semantic Scholar
Reassessing the evidence of a survival advantage in Type 2 diabetes treated with metformin compared with controls without diabetes: a retrospective cohort study.
M. Keys, M. Thinggaard, L. A. Larsen, D. Pedersen +2 more
2022International Journal of Epidemiology13 citations
Semantic Scholar
Systemic hormone therapy and dementia: A nested case-control and co-twin control study
L. E. Løkkegaard, M. Thinggaard, M. Nygaard, J. Hallas +2 more
2022Maturitas13 citations Open access
Semantic Scholar
Statin use and peripheral nerve function—A prospective follow‐up study
Toke de Koning Svendsen, T. Krøigård, M. Wirenfeldt, H. D. Schrøder +5 more
2020Basic & Clinical Pharmacology & Toxicology13 citations Open access
Semantic Scholar
Bias in case-crossover studies of medications due to persistent use: A simulation study
K. Bykov, Shirley V. Wang, J. Hallas, A. Pottegård +2 more
2020Pharmacoepidemiology and Drug Safety13 citations Open access
Semantic Scholar
Association Between Statin Use and Intracerebral Hemorrhage Location
Nils Jensen Boe, S. Hald, Mie Micheelsen Jensen, J. A. Bojsen +12 more
2022Neurology12 citations Open access
Semantic Scholar
Changing characteristics over time of individuals receiving COVID-19 vaccines in Denmark: A population-based descriptive study of vaccine uptake
Mette Reilev, M. Olesen, H. Kildegaard, H. Støvring +9 more
2022medRxiv12 citations Open access
Semantic Scholar
Association of Statin Use With Risk of Stroke Recurrence After Intracerebral Hemorrhage
D. Gaist, L. A. García Rodríguez, J. Hallas, S. Hald +4 more
2023Neurology11 citations Open access
Semantic Scholar
Inhalation anaesthesia compared with total intravenous anaesthesia and postoperative complications in colorectal cancer surgery: an observational registry-based study†.
R. Hasselager, J. Hallas, I. Gögenur
2022British Journal of Anaesthesia11 citations Open access
Semantic Scholar
Medication incidents and medication errors in Danish healthcare: A descriptive study based on medication incident reports from the Danish Patient Safety Database, 2014–2018
O. Tchijevitch, J. Hallas, S. B. Bogh, S. Birkeland
2023Basic & Clinical Pharmacology & Toxicology10 citations Open access
Semantic Scholar
Oral anticoagulants in patients with atrial fibrillation at low stroke risk: a multicentre observational study
J. Komen, A. Pottegård, A. Mantel-Teeuwisse, T. Forslund +10 more
2022European Heart Journal10 citations Open access
Semantic Scholar
Continued potassium supplementation use following loop diuretic discontinuation in older adults: an evaluation of a prescribing cascade relic
Grace Hsin-Min Wang, E. Morris, Steven M. Smith, J. Hallas +1 more
2022Journal of The American Geriatrics Society10 citations Open access
Semantic Scholar
Selective serotonin reuptake inhibitors and the risk of restless legs syndrome: a symmetry analysis
A. Dunvald, D. Henriksen, J. Hallas, M. Christensen +1 more
2020European Journal of Clinical Pharmacology10 citations
Semantic Scholar
Using the waiting time distribution with random index dates to estimate prescription durations in the presence of seasonal stockpiling
Katrine Bødkergaard, R. Selmer, J. Hallas, L. Kjerpeseth +3 more
2020Pharmacoepidemiology and Drug Safety10 citations Open access
Semantic Scholar

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A. Pottegård×22
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A. Pottegård — researcher profile on SciRah
L. Lund×16
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L. Lund — researcher profile on SciRah
M. Højlund×8
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M. Højlund — researcher profile on SciRah
D. Gaist×8
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L. A. García Rodríguez

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D. Henriksen×6

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H. Støvring — researcher profile on SciRah