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A. Zapf · SciRah

Researcher profile · Semantic Scholar

A. Zapf

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A. Zapf — researcher profile on SciRah

h-index: 30
Works: 110
Citations: 3,163

Most-cited papers

Measuring inter-rater reliability for nominal data – which coefficients and confidence intervals are appropriate?
A. Zapf, S. Castell, L. Morawietz, A. Karch
2016BMC Medical Research Methodology352 citations Open access
Semantic Scholar
Intestinal current measurement for diagnostic classification of patients with questionable cystic fibrosis: validation and reference data
N. Derichs, J. Sanz, Thomas Von Kanel, C. Stolpe +4 more
2010Thorax141 citations Open access
Semantic Scholar
Application and Limitations of Transient Liver Elastography in Children
Imeke Goldschmidt, Carolin Streckenbach, Carmen Dingemann, Eva-Doreen Pfister +3 more
2013Journal of Pediatric Gastroenterology and Nutrition - JPGN126 citations Open access
Semantic Scholar
Weight loss, dysphagia and supplement intake in patients with amyotrophic lateral sclerosis (ALS): impact on quality of life and therapeutic options
S. Körner, M. Hendricks, K. Kollewe, A. Zapf +3 more
2013BMC Neurology121 citations Open access
Semantic Scholar
Neutrophil Gelatinase-Associated Lipocalin Measured on Clinical Laboratory Platforms for the Prediction of Acute Kidney Injury and the Associated Need for Dialysis Therapy: A Systematic Review and Meta-analysis.
C. Albert, A. Zapf, M. Haase, C. Röver +34 more
2020American Journal of Kidney Diseases120 citations Open access
Semantic Scholar
One-Stop Management of Acute Stroke Patients: Minimizing Door-to-Reperfusion Times
M. Psychogios, D. Behme, K. Schregel, I. Tsogkas +7 more
2017Stroke115 citations Open access
Semantic Scholar
Clinical evaluation of an autofluorescence diagnostic device for oral cancer detection: a prospective randomized diagnostic study
M. Rana, A. Zapf, Marco Kuehle, N. Gellrich +1 more
2012European Journal of Cancer Prevention106 citations
Semantic Scholar
Onset and spreading patterns of upper and lower motor neuron symptoms in amyotrophic lateral sclerosis
S. Körner, K. Kollewe, M. Fahlbusch, A. Zapf +3 more
2011Muscle and Nerve80 citations
Semantic Scholar
Endoscopic vacuum therapy versus stenting for postoperative esophago-enteric anastomotic leakage: systematic review and meta-analysis
P. Scognamiglio, M. Reeh, Karl-Frederick Karstens, Eugen Bellon +6 more
2020Endoscopy79 citations
Semantic Scholar
Speech therapy and communication device: Impact on quality of life and mood in patients with amyotrophic lateral sclerosis
S. Körner, M. Siniawski, K. Kollewe, K. J. Rath +4 more
2013Amyotrophic Lateral Sclerosis and Frontotemporal Degeneration75 citations
Semantic Scholar
Biomarker-Guided Risk Assessment for Acute Kidney Injury: Time for Clinical Implementation?
C. Albert, M. Haase, A. Albert, A. Zapf +2 more
2021Annals of Laboratory Medicine73 citations Open access
Semantic Scholar
The REM Sleep Behavior Disorder Screening Questionnaire is not Valid in De Novo Parkinson's Disease
C. Halsband, A. Zapf, F. Sixel-Döring, C. Trenkwalder +1 more
2018Movement Disorders Clinical Practice68 citations Open access
Semantic Scholar
Interaction of physical function, quality of life and depression in Amyotrophic lateral sclerosis: characterization of a large patient cohort
S. Körner, K. Kollewe, S. Abdulla, A. Zapf +2 more
2015BMC Neurology67 citations Open access
Semantic Scholar
A modified Wald interval for the area under the ROC curve (AUC) in diagnostic case-control studies
M. Kottas, O. Kuss, A. Zapf
2014BMC Medical Research Methodology66 citations Open access
Semantic Scholar
Comparing different thrombectomy techniques in five large-volume centers: a ‘real world’ observational study
A. Hesse, D. Behme, A. Kemmling, A. Zapf +13 more
2017Journal of NeuroInterventional Surgery65 citations Open access
Semantic Scholar
Acute adverse events in cardiac MR imaging with gadolinium-based contrast agents: results from the European Society of Cardiovascular Radiology (ESCR) MRCT Registry in 72,839 patients
J. Uhlig, C. Lücke, R. Vliegenthart, C. Loewe +13 more
2019European Radiology50 citations Open access
Semantic Scholar
Noninferiority of Artificial Intelligence-Assisted Analysis of Ki-67 and Estrogen/Progesterone Receptor in Breast Cancer Routine Diagnostics.
N. Abele, K. Tiemann, T. Krech, A. Wellmann +16 more
2023Modern Pathology49 citations Open access
Semantic Scholar
A Deep Learning Approach for Histopathological Diagnosis of Onychomycosis: Not Inferior to Analogue Diagnosis by Histopathologists
Florence Decroos, S. Springenberg, Tobias Lang, M. Päpper +4 more
2021Acta Dermato-Venereologica49 citations Open access
Semantic Scholar
Role of CX3C-chemokine CX3C-L/fractalkine expression in a model of slowly progressive renal failure.
M. Koziolek, G. Müller, A. Zapf, D. Patschan +6 more
2010Nephrology, Dialysis and Transplantation42 citations Open access
Semantic Scholar
Prospective postmortem evaluation of 735 consecutive SARS-CoV-2-associated death cases
A. Fitzek, J. Schädler, E. Dietz, A. Ron +30 more
2021Scientific Reports41 citations Open access
Semantic Scholar
The role of cone-beam breast-CT for breast cancer detection relative to breast density
S. Wienbeck, J. Uhlig, S. Luftner-Nagel, A. Zapf +5 more
2017European Radiology41 citations
Semantic Scholar
Effects of Coronavirus Disease (COVID-19) Related Contact Restrictions in Germany, March to May 2020, on the Mobility and Relation to Infection Patterns
S. Bönisch, K. Wegscheider, Linda Krause, S. Sehner +4 more
2020Frontiers in Public Health40 citations Open access
Semantic Scholar
Is there a therapeutic benefit of complete lymph node dissection in melanoma patients with low tumor burden in the sentinel node?
I. Satzger, A. Meier, A. Zapf, M. Niebuhr +2 more
2014Melanoma research39 citations
Semantic Scholar
The Axon Guidance Protein Semaphorin 3A Is Increased in the Motor Cortex of Patients With Amyotrophic Lateral Sclerosis
S. Körner, S. Böselt, K. Wichmann, N. Thau-Habermann +4 more
2016Journal of Neuropathology and Experimental Neurology37 citations Open access
Semantic Scholar
Conventional versus neutral positioning in central neurological disease: a multicenter randomized controlled trial.
H. Pickenbrock, V. U. Ludwig, A. Zapf, D. Dressler
2015Deutsches Ärzteblatt International30 citations Open access
Semantic Scholar
Influence of Environment and Lifestyle on Incidence and Progress of Amyotrophic Lateral Sclerosis in A German ALS Population
S. Korner, Johanna Kammeyer, A. Zapf, M. Kuźma-Kozakiewicz +8 more
2019Aging and Disease29 citations Open access
Semantic Scholar
Efficacy and Safety of an Everolimus- vs. a Mycophenolate Mofetil-Based Regimen in Pediatric Renal Transplant Recipients
L. Brunkhorst, A. Fichtner, B. Höcker, G. Burmeister +6 more
2015PLoS ONE29 citations Open access
Semantic Scholar
Nodal Basin Recurrence After Sentinel Lymph Node Biopsy for Melanoma
L. Kretschmer, H. Bertsch, A. Zapf, C. Mitteldorf +6 more
2015Medicine28 citations Open access
Semantic Scholar
Evaluation of two family-based intervention programs for children affected by rare disease and their families – research network (CARE-FAM-NET): study protocol for a rater-blinded, randomized, controlled, multicenter trial in a 2x2 factorial design
Johannes Boettcher, B. Filter, J. Denecke, Amra Hot +9 more
2020BMC Family Practice27 citations Open access
Semantic Scholar
Outcome Prediction Using Perfusion Parameters and Collateral Scores of Multi-Phase and Single-Phase CT Angiography in Acute Stroke: Need for One, Two, Three, or Thirty Scans?
K. Schregel, I. Tsogkas, Carolin Peter, A. Zapf +6 more
2018Journal of Stroke27 citations Open access
Semantic Scholar
A comparison between the Static Balance Test and the Berg Balance Scale: validity, reliability, and comparative resource use
H. Pickenbrock, Andreas Diel, A. Zapf
2016Clinical Rehabilitation27 citations Open access
Semantic Scholar
Partial verification bias and incorporation bias affected accuracy estimates of diagnostic studies for biomarkers that were part of an existing composite gold standard.
A. Karch, A. Koch, A. Zapf, I. Zerr +1 more
2016Journal of Clinical Epidemiology25 citations Open access
Semantic Scholar
Randomised controlled trial on differential learning of toothbrushing in 6- to 9-year-old children
Sven-Olav Pabel, Franziska Freitag, V. Hraský, A. Zapf +1 more
2018Clinical Oral Investigations24 citations
Semantic Scholar
Sample size calculation and re-estimation based on the prevalence in a single-arm confirmatory diagnostic accuracy study
M. Stark, A. Zapf
2020Statistical Methods in Medical Research21 citations Open access
Semantic Scholar
Why do you need a biostatistician?
A. Zapf, G. Rauch, M. Kieser
2020BMC Medical Research Methodology21 citations Open access
Semantic Scholar
What makes a biostatistician?
A. Zapf, M. Huebner, G. Rauch, M. Kieser
2018Statistics in Medicine19 citations
Semantic Scholar
Relevance of supraventricular runs detected after cerebral ischemia
Mark Weber-Krüger, C. Lutz, A. Zapf, R. Stahrenberg +6 more
2017Neurology18 citations
Semantic Scholar
Nonparametric meta‐analysis for diagnostic accuracy studies
A. Zapf, A. Hoyer, Katharina Kramer, O. Kuss
2015Statistics in Medicine18 citations
Semantic Scholar
Studies for the Evaluation of Diagnostic Tests- Part 28 of a Series on Evaluation of Scientific Publications.
A. Hoyer, A. Zapf
2021Deutsches Ärzteblatt International17 citations Open access
Semantic Scholar
Absence of DNA double-strand breaks in human peripheral blood mononuclear cells after 3 Tesla magnetic resonance imaging assessed by γH2AX flow cytometry
M. Fasshauer, Thomas Krüwel, A. Zapf, Vera Stahnke +8 more
2018European Radiology16 citations Open access
Semantic Scholar
In Hypertrophic Cardiomyopathy Reduction of Relative Resting Myocardial Blood Flow Is Related to Late Enhancement, T2-Signal and LV Wall Thickness
K. Hueper, A. Zapf, J. Skrok, Aurelio Pinheiro +9 more
2012PLoS ONE16 citations Open access
Semantic Scholar
Time extrapolation in regulatory risk assessment: The impact of study differences on the extrapolation factors.
S. Escher, I. Mangelsdorf, S. Hoffmann-Doerr, F. Partosch +4 more
2020Regulatory toxicology and pharmacology : RTP15 citations Open access
Semantic Scholar
Pubertal Development in Pediatric Kidney Transplant Patients Receiving Mammalian Target of Rapamycin Inhibitors or Conventional Immunosuppression
Julia Förster, T. Ahlenstiel-Grunow, A. Zapf, M. Mynarek +1 more
2016Transplantation15 citations
Semantic Scholar
Depression screening using patient-targeted feedback in general practices: study protocol of the German multicentre GET.FEEDBACK.GP randomised controlled trial
S. Kohlmann, M. Lehmann, M. Eisele, Lea-Elena Braunschneider +16 more
2020BMJ Open14 citations Open access
Semantic Scholar
Difference of two dependent sensitivities and specificities: Comparison of various approaches
D. Wenzel, A. Zapf
2013Biometrical journal. Biometrische Zeitschrift14 citations
Semantic Scholar
Low‐Density Lipoprotein Apheresis Decreases Ferritin, Transferrin and Vitamin B12, Which May Cause Anemia in Serially Treated Patients
C. Bramlage, V. W. Armstrong, A. Zapf, P. Bramlage +2 more
2010Therapeutic apheresis and dialysis14 citations
Semantic Scholar
The efficacy of automated feedback after internet-based depression screening: Study protocol of the German, three-armed, randomised controlled trial DISCOVER
Franziska Sikorski, H. König, K. Wegscheider, A. Zapf +2 more
2021Internet Interventions13 citations Open access
Semantic Scholar
A Wild Bootstrap approach for the selection of biomarkers in early diagnostic trials
A. Zapf, E. Brunner, Frank Konietschke
2015BMC Medical Research Methodology13 citations Open access
Semantic Scholar
Meta‐analysis of diagnostic accuracy studies with multiple thresholds: Comparison of different approaches
A. Zapf, C. Albert, C. Frömke, M. Haase +3 more
2020Biometrical journal. Biometrische Zeitschrift12 citations Open access
Semantic Scholar
Pulmonary Function Tests for the Prediction of Postoperative Pulmonary Complications-a Systematic Review.
André Dankert, T. Dohrmann, Benjamin Löser, A. Zapf +2 more
2022Deutsches Ärzteblatt International11 citations Open access
Semantic Scholar

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