1. Centre for Pharmacoepidemiology, Department of Medicine Solna; Karolinska Institute, Karolinska University Hospital; T2 SE-171 76 Stockholm Sweden
2. Department of Pharmaceutical Sciences; Utrecht University; Universiteitsweg 99 3584 CG Utrecht the Netherlands
3. Public Healthcare Services Committee, Department of Healthcare Development; Stockholm County Council; Box 6909 102 39 Stockholm Sweden
4. Department of Medicine Solna, Clinical Epidemiology/Clinical Pharmacology; Karolinska Institutet and Karolinska University Hospital; L7:03 SE-171 76 Stockholm Sweden