1. Department of Family Medicine, Medical Faculty , University of Ljubljana , Poljanski nasip 58 , Ljubljana , Slovenia
2. National Institute of Public Health , Trubarjeva 2 , Ljubljana , Slovenia
3. Department of Family Medicine, Medical Faculty , University of Maribor , Taborska 8 , Maribor , Slovenia
4. Ljubljana Community Health Centre , Metelkova 9 , Ljubljana , Slovenia