1. University of Turku, Turku, Finland, and Kellokoski Hospital, Tuusula, Finland,
2. University of Turku and Hospital District of Southwest Finland, Turku, Finland
3. Vanha Vaasa Hospital, Vaasa, Finland
4. University of Turku, Turku, Finland, and Primary Health Care Organisation of City of Vantaa, Vantaa, Finland
5. Dublin City University, Dublin, Republic of Ireland
6. Helsinki University Central Hospital, Helsinki, Finland