1. Community Health Centre Ljubljana , Metelkova 9 , Ljubljana , Slovenia
2. Institute for Biostatistics and Medical Informatics, Medical Faculty , University of Ljubljana , Vrazov trg 2 , Ljubljana , Slovenia
3. Department of Family Medicine, Medical Faculty , University of Ljubljana , Poljanski nasip 58 , Ljubljana , Slovenia
4. Department of Family Medicine, Medical Faculty , University of Maribor , Taborska 8 , Maribor , Slovenia