1. Department of Paediatrics and Child Health, Karachi
2. Department of Pathology and Laboratory Medicine, Aga Khan University, Karachi
3. Department of Paediatrics and Child Health, Aga Khan Maternal and Child Center, Hyderabad
4. Provincial Disease Surveillance Unit, Director-General Health Office, Pakistan
5. District Polio Control Room, Hyderabad, Sindh, Pakistan