[1] Minist Hlth Nutr & Indigenous Med, Suwasiripaya 38, Rev Baddegama Wimalawans 10, Colombo, Sri Lanka
[2] Univ Kelaniya, Fac Med, Dept Pediat, Colombo, Sri Lanka
[3] Univ Colombo, Fac Med, Dept Community Med, Colombo, Sri Lanka
[4] Univ Lincoln, Coll Social Sci, Sch Hlth & Social Care, Community & Hlth Res Unit CaHRU, Lincoln LN6 7TS, England
[5] WHO, Country Off Sri Lanka, 5,Anderson Rd, Colombo 05, Sri Lanka