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Preventive Medicine|January 1, 1993
Oral contraceptive use and the occurrence of gallstone disease--a case-control studyC Thijs, P Leffers, P KnipschildAmerican Journal of Epidemiology|February 1, 1992
Is gallstone disease caused by obesity or by dieting?C Thijs, P Knipschild, P LeffersAmerican Journal of Epidemiology|July 15, 1991
Pregnancy and gallstone disease: an empiric demonstration of the importance of specification of risk periodsC Thijs, P Knipschild, P LeffersJournal of Clinical Epidemiology|January 1, 1991
Does alcohol protect against the formation of gallstones? A demonstration of protopathic biasC Thijs, P Knipschild, P LeffersJournal of Clinical Epidemiology|October 1, 1992
The influence of referral patterns on the characteristics of diagnostic testsJ A Knottnerus, P LeffersNederlands Tijdschrift Voor Geneeskunde|October 29, 1994
[Lack of uniformity and low compliance concerning wake-up advice following head trauma]A de Louw, A Twijnstra, P LeffersJournal of Clinical Epidemiology|January 1, 1991
The qualification periodP Knipschild, P Leffers, A R FeinsteinNederlands Tijdschrift Voor Geneeskunde|November 28, 1992
[Is skull radiography indicated in patients with head injuries?]P Pasman, A Twijnstra, J Wilmink, et al.Canadian Family Physician Medecin De Famille Canadien|January 12, 2011
Urine Test Strips: How reproducible are readings?R A Winkens, P Leffers, C P DegenaarJournal Belge De Radiologie|June 1, 1995
The value of skull radiography in patients with head traumaP Pasman, A Twijnstra, J Wilmink, et al.Pageof 14