[1] Univ Copenhagen, Dept Publ Hlth, Oster Farimagsgade 5,Bldg 9, DK-1014 Copenhagen K, Denmark
[2] Univ Sydney, Fac Med & Hlth, Cent Clin Sch, Camperdown, Australia
[3] Rajarata Univ Sri Lanka, Fac Med & Allied Sci, Dept Family Med, Mihintale, Sri Lanka
[4] Univ Copenhagen, Dept Publ Hlth, Copenhagen, Denmark
[5] Rajarata Univ Sri Lanka, Fac Appl Sci, Dept Hlth Promot, Mihintale, Sri Lanka