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G. Holtman · SciRah

Researcher profile · Semantic Scholar

G. Holtman

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G. Holtman — researcher profile on SciRah

h-index: 18
Works: 67
Citations: 1,252

Most-cited papers

Diagnostic accuracy of magnetic resonance imaging techniques for treatment response evaluation in patients with high-grade glioma, a systematic review and meta-analysis
B. R. V. van Dijken, P. V. van Laar, G. Holtman, A. van der Hoorn
2017European Radiology229 citations Open access
Semantic Scholar
Incidence of Tumour Progression and Pseudoprogression in High-Grade Gliomas: a Systematic Review and Meta-Analysis
A. Abbasi, H. Westerlaan, G. Holtman, K. Aden +2 more
2017Clinical Neuroradiology145 citations Open access
Semantic Scholar
Noninvasive Tests for Inflammatory Bowel Disease: A Meta-analysis
G. Holtman, Yvonne Lisman-van Leeuwen, J. Reitsma, M. Berger
2016Pediatrics78 citations Open access
Semantic Scholar
Routine laboratory testing to determine if a patient has COVID‐19
I. Stegeman, E. Ochodo, F. Guleid, G. Holtman +14 more
2020Cochrane Database of Systematic Reviews70 citations Open access
Semantic Scholar
Diagnostic Accuracy of PET Tracers for the Differentiation of Tumor Progression from Treatment-Related Changes in High-Grade Glioma: A Systematic Review and Metaanalysis
P. D. de Zwart, B. R. J. van Dijken, G. Holtman, G. Stormezand +3 more
2019Journal of Nuclear Medicine68 citations Open access
Semantic Scholar
Use of Laboratory Markers in Addition to Symptoms for Diagnosis of Inflammatory Bowel Disease in Children: A Meta-analysis of Individual Patient Data
G. Holtman, Yvonne Lisman-van Leeuwen, A. Day, U. Fagerberg +9 more
2017JAMA pediatrics52 citations Open access
Semantic Scholar
Dientamoeba fragilis colonization is not associated with gastrointestinal symptoms in children at primary care level
G. Holtman, Justin J Kranenberg, M. Blanker, A. Ott +2 more
2017Family Practice43 citations
Semantic Scholar
Diagnostic Accuracy of Fecal Calprotectin for Pediatric Inflammatory Bowel Disease in Primary Care: A Prospective Cohort Study
G. Holtman, Y. L. Leeuwen, B. Kollen, O. Norbruis +5 more
2016Annals of Family Medicine36 citations Open access
Semantic Scholar
Diagnostic accuracy of blood tests of inflammation in paediatric appendicitis: a systematic review and meta-analysis
D. Fawkner-Corbett, G. Hayward, Mohammed Alkhmees, A. Van den Bruel +2 more
2022BMJ Open35 citations Open access
Semantic Scholar
General practitioner referrals to one-stop clinics for symptoms that could be indicative of cancer: a systematic review of use and clinical outcomes.
Claire Friedemann Smith, A. Tompson, G. Holtman, C. Bankhead +3 more
2018Family Practice31 citations Open access
Semantic Scholar
Development and validation of a clinical prediction tool to estimate the individual risk of depressive relapse or recurrence in individuals with recurrent depression.
Nicola S. Klein, G. Holtman, C. Bockting, M. Heymans +1 more
2018Journal of Psychiatric Research31 citations Open access
Semantic Scholar
Diagnostic accuracy of magnetic resonance imaging techniques for treatment response evaluation in patients with head and neck tumors, a systematic review and meta-analysis
A. van der Hoorn, P. V. van Laar, G. Holtman, H. Westerlaan
2017PLoS ONE30 citations Open access
Semantic Scholar
Development of practical recommendations for diagnostic accuracy studies in low prevalence situations.
G. Holtman, M. Berger, H. Burger, J. Deeks +8 more
2019Journal of Clinical Epidemiology28 citations Open access
Semantic Scholar
Bladder Symptoms in Children With Functional Constipation: A Systematic Review
J. van Summeren, G. Holtman, Sonja C. van Ommeren, B. Kollen +2 more
2018Journal of Pediatric Gastroenterology and Nutrition - JPGN24 citations Open access
Semantic Scholar
Non-contact infrared versus axillary and tympanic thermometers in children attending primary care: a mixed-methods study of accuracy and acceptability.
G. Hayward, J. Verbakel, F. Ismail, George Edwards +7 more
2020The British journal of general practice : the journal of the Royal College of General Practitioners22 citations Open access
Semantic Scholar
Avoid Endoscopy in Children With Suspected Inflammatory Bowel Disease Who Have Normal Calprotectin Levels
A. Heida, G. Holtman, Yvonne Lisman-van Leeuwen, M. Berger +1 more
2016Journal of Pediatric Gastroenterology and Nutrition - JPGN22 citations
Semantic Scholar
Challenges in diagnostic accuracy studies in primary care: the fecal calprotectin example
G. Holtman, Y. L. Leeuwen, B. Kollen, J. Escher +3 more
2013BMC Family Practice20 citations Open access
Semantic Scholar
Added value of CRP to clinical features when assessing appendicitis in children
Guus Blok, Eelke D Nikkels, J. van der Lei, M. Berger +1 more
2022European Journal of General Practice19 citations Open access
Semantic Scholar
Accuracy of routine laboratory tests to predict mortality and deterioration to severe or critical COVID-19 in people with SARS-CoV-2
J. Verbakel, Liselore De Rop, I. Stegeman, G. Holtman +15 more
2021Cochrane Database of Systematic Reviews18 citations Open access
Semantic Scholar
Oral ondansetron for paediatric gastroenteritis in primary care: a randomised controlled trial
Irma J. Bonvanie, A. Weghorst, G. Holtman, Heleen A Russchen +4 more
2021The British journal of general practice : the journal of the Royal College of General Practitioners17 citations Open access
Semantic Scholar
[Point-of-care testing in family practices: present use and need for tests in the future].
J. Cals, Angel Schols, H. V. van Weert, Femke Stevens +4 more
2014Nederlandsch tijdschrift voor geneeskunde16 citations
Semantic Scholar
Diagnostic accuracy of follow‐up tests for detecting colorectal cancer recurrences in primary care: A systematic review and meta‐analysis
Geertje B. Liemburg, D. Brandenbarg, M. Berger, S. Duijts +4 more
2021European Journal of Cancer Care14 citations Open access
Semantic Scholar
Appendicitis in children with acute abdominal pain in primary care, a retrospective cohort study.
Guus Blok, Laura M M Veenstra, J. van der Lei, M. Berger +1 more
2021Family Practice14 citations Open access
Semantic Scholar
Diagnostic test strategies in children at increased risk of inflammatory bowel disease in primary care
G. Holtman, Yvonne Lisman-van Leeuwen, B. Kollen, O. Norbruis +6 more
2017PLoS ONE14 citations Open access
Semantic Scholar
Non-contact infrared thermometers compared with current approaches in primary care for children aged 5 years and under: a method comparison study.
A. Van den Bruel, J. Verbakel, Kay Wang, S. Fleming +14 more
2020Health Technology Assessment12 citations Open access
Semantic Scholar
Evaluation of point-of-care test calprotectin and lactoferrin for inflammatory bowel disease among children with chronic gastrointestinal symptoms
G. Holtman, Yvonne Lisman-van Leeuwen, P. V. van Rheenen, B. Kollen +4 more
2016Family Practice12 citations Open access
Semantic Scholar
Parent-child Agreement on Health-Related Quality of Life in Children With Functional Constipation in Primary Care
J. van Summeren, J. W. Klunder, G. Holtman, B. Kollen +2 more
2018Journal of Pediatric Gastroenterology and Nutrition - JPGN11 citations Open access
Semantic Scholar
Diagnostic performance of preoperative CT in differentiating between benign and malignant origin of suspicious gallbladder lesions.
H. Kuipers, F. Hoogwater, G. Holtman, J. Slangen +2 more
2021European Journal of Radiology10 citations Open access
Semantic Scholar
Course of uncomplicated acute gastroenteritis in children presenting to out-of-hours primary care
A. Weghorst, Irma J. Bonvanie, G. Holtman, M. D. de Boer +1 more
2021BMC Primary Care9 citations Open access
Semantic Scholar
Clinical value of diffusion-weighted MRI for differentiation between benign and malignant gallbladder disease: a systematic review and meta-analysis
H. Kuipers, F. Hoogwater, G. Holtman, A. van der Hoorn +2 more
2020Acta Radiologica9 citations Open access
Semantic Scholar
Physiotherapy plus conventional treatment versus conventional treatment only in the treatment of functional constipation in children: design of a randomized controlled trial and cost-effectiveness study in primary care
J. van Summeren, G. Holtman, Yvonne Lisman-van Leeuwen, L. Louer +5 more
2018BMC Pediatrics9 citations Open access
Semantic Scholar
Physiotherapy for Children with Functional Constipation
J. van Summeren, G. Holtman, B. Kollen, YvonneLisman +4 more
20198 citations
Semantic Scholar
Home-based guided hypnotherapy for children with functional abdominal pain and irritable bowel syndrome in primary care: study protocol for a randomised controlled trial
I. Ganzevoort, Tryntsje Fokkema, Harma Mol-Alma, A. Heida +6 more
2023BMJ Open7 citations Open access
Semantic Scholar
Challenges In Performing An Individual Participant-level Data Meta-analysis.
H. van der Worp, G. Holtman, M. Blanker
2023European Urology Focus7 citations Open access
Semantic Scholar
Rotavirus and illness severity in children presenting with acute gastroenteritis at the primary care out-of-hours service
Pien I Wolters, G. Holtman, A. Weghorst, M. Knoester +1 more
2021European Journal of General Practice7 citations Open access
Semantic Scholar
Accuracy of diagnostic tests for acute diverticulitis that are feasible in primary care: a systematic review and meta-analysis
Natasja D. Vijfschagt, M. D. de Boer, M. Berger, Huib Burger +1 more
2024Family Practice6 citations Open access
Semantic Scholar
Qualitative study evaluating the expectations and experiences of Dutch parents of children with chronic gastrointestinal symptoms visiting their general practitioner
S. Ansems, I. Ganzevoort, D. V. van Tol, Tryntsje Fokkema +3 more
2023BMJ Open6 citations Open access
Semantic Scholar
Effect of faecal calprotectin testing on referrals for children with chronic gastrointestinal symptoms in primary care: study protocol for a cluster randomised controlled trial
S. Ansems, M. Berger, P. V. van Rheenen, K. Vermeulen +3 more
2021BMJ Open5 citations Open access
Semantic Scholar
Developing a clinical prediction rule for repeated consultations with functional somatic symptoms in primary care: a cohort study
G. Holtman, H. Burger, R. Verheij, H. Wouters +3 more
2021BMJ Open5 citations Open access
Semantic Scholar
Cost-effectiveness of oral ondansetron for children with acute gastroenteritis in primary care: a randomised controlled trial
A. Weghorst, G. Holtman, Irma J. Bonvanie, Pien I Wolters +3 more
2021The British journal of general practice : the journal of the Royal College of General Practitioners5 citations Open access
Semantic Scholar
Referral rates for children with acute gastroenteritis: a retrospective cohort study
Pien I Wolters, G. Holtman, Freek Fickweiler, Irma J. Bonvanie +4 more
2020BJGP open5 citations Open access
Semantic Scholar
Recommendations for clinical research in children presenting to primary care out-of-hours services: a randomised controlled trial with parallel cohort study
A. Weghorst, G. Holtman, Pien I Wolters, Heleen A Russchen +7 more
2020BJGP open5 citations Open access
Semantic Scholar
Physiotherapy for Children with Functional Constipation: A Pragmatic Randomized Controlled Trial in Primary Care.
J. van Summeren, G. Holtman, B. Kollen, Yvonne Lisman-van Leeuwen +4 more
2019Jornal de Pediatria5 citations Open access
Semantic Scholar
Development and validation of a clinical prediction rule for acute appendicitis in children in primary care
Guus Blok, Huib Burger, J. van der Lei, Marjolein Berger +1 more
2023European Journal of General Practice4 citations Open access
Semantic Scholar
Management of children with non-acute abdominal pain and diarrhea in Dutch primary care: a retrospective cohort study based on a routine primary care database (AHON)
S. Ansems, M. Berger, Elaine Pieterse, Sjaantje Nanne +3 more
2023Scandinavian Journal of Primary Health Care4 citations Open access
Semantic Scholar
A care substitution service in the Netherlands: impact on referral, cost, and patient satisfaction
T. Albada, M. Berger, Wim Brunninkhuis, Daphne van Kalken +3 more
2023BMC Primary Care4 citations Open access
Semantic Scholar
Children’s and Their Parents’ Experiences With Home-Based Guided Hypnotherapy: Qualitative Study
I. Ganzevoort, Adriëlla L. van der Veen, M. Alma, M. Berger +1 more
2025JMIR Pediatrics and Parenting3 citations Open access
Semantic Scholar
Trends in C reactive protein testing: a retrospective cohort study in paediatric ambulatory care settings
Mohammed Alkhmees, A. Van den Bruel, Gail N. Hayward, M. Blanker +2 more
2024BMJ Open3 citations Open access
Semantic Scholar
What is important to the GP in recognizing acute appendicitis in children: a delphi study
Guus Blok, M. Berger, Arjan B. Ahmeti, G. Holtman
2023BMC Primary Care3 citations Open access
Semantic Scholar
Irritable bowel syndrome in children with chronic gastrointestinal symptoms in primary care
Esmee M Hogervorst, I. Ganzevoort, M. Berger, G. Holtman
2023Family Practice2 citations Open access
Semantic Scholar

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