1. Maternal and Child Morbidity and Mortality Surveillance Unit, Family Health Bureau, Ministry of Health, 231 De Saram Place Colombo 10, Sri Lanka
2. Boston University, College of Health and Rehabilitation Sciences: Sargent College, Department of Occupational Therapy, 635 Commonwealth Ave. Boston, MA 02215, USA
3. Department of Community Medicine, Faculty of Medicine, University of Colombo, Sri Lanka