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aDepartment of Internal Medicine, The Netherlands bDepartment of Clinical Epidemiology and Medical Technology Assessment, The Netherlands cCardiovascular Research Institute Maastricht (CARIM), The Netherlands dCare and Public Health Research Institute, The Netherlands eDepartment of Obstetrics and Gynaecology, Maastricht University Medical Centre (MUMC), Maastricht, The Netherlands Correspondence to Isabel Ferreira, PhD, Department for Clinical Epidemiology and Medical Technological Assessment, Maastricht University Medical Centre, P.O. Box 5800, 6202 AZ Maastricht, The Netherlands Tel: +31 43 3874386; fax: +31 43 3874419; e-mail: email protected
Ferreira et al. (Thu,) studied this question.