[1] Rajarata Univ Sri Lanka, Fac Med & Allied Sci, Dept Community Med, Saliyapura, Sri Lanka
[2] Rajarata Univ Sri Lanka, Fac Med & Allied Sci, Dept Obstet & Gynaecol, Saliyapura, Sri Lanka
[3] Teaching Hosp, Anuradhapura, Sri Lanka
[4] Base Hosp, Thambuththegama, Sri Lanka