Müller, Ursa; Tänzler, Kristinac; Bürger, Alexandrad; Staub, Lukasa; Tamcan, Özgüra; Roeder, Christopha; Jüni, Peterb,*; Trelle, Svenb
aInstitute for Evaluative Research in Orthopedic Surgery, University of Bern, Switzerland
bDivision of Clinical Epidemiology and Biostatistics, Institute of Social and Preventive Medicine (ISPM), University of Bern, Finkenhubelweg 11, CH-3012 Bern, Switzerland
cDivision of Internal Medicine, Tiefenau Hospital, Bern, Switzerland
dDepartment of Internal Medicine, University Hospital Inselspital, and University of Bern, Switzerland
*Corresponding author. Tel.: +41 31 631 33 78; fax: +41 31 631 35 20.
E-mail: [email protected]
Submitted February 14, 2007; received in revised form May 23, 2007; accepted June 15, 2007.