1. Department of Psychology; Institute of Behavioral Sciences; University of Helsinki; Helsinki Finland
2. Department of General Practice and Primary Health Care; University of Helsinki; Helsinki Finland
3. Texas Christian University; Forth Worth Texas
4. Department of Health Promotion and Chronic Disease Prevention; National Institute for Health and Welfare; Helsinki Finland
5. Unit of General Practice; Helsinki University Central Hospital; Helsinki Finland
6. Folkhälsan Research Center; Helsinki Finland