Design
The current study employed a longitudinal design and was embedded within two ongoing research projects, namely the BARIA and Diabar- studies. Patients were recruited from the outpatient clinics of Surgery and Internal medicine at MC Slotervaart (Amsterdam), Spaarne Gasthuis (Hoofddorp) and Franciscus Gasthuis (Rotterdam) in the Netherlands. More details of the BARIA-study are described in a protocol paper [