1. From the Department of Clinical Epidemiology (C.Y.V., F.R.R.), Leiden University Medical Center, Leiden, The Netherlands; the Department of Haematology (I.D.W.), Glasgow Royal Infirmary, Glasgow, UK; the Department for Coagulation Disorders (P.S.), University Hospital, Malmö, Sweden; the Department of Haematology (J.C.S., J.F.), Hospital de la Santa Creu i Sant Pau, Barcelona, Spain; the Department of Internal Medicine (I.S.), University Hospital, Frankfurt/Main, Germany; the Department of...