1. National Institute of Diseases of Chest and Hospital Dhaka Bangladesh
2. Directorare General of Health Services Dhaka Bangladesh
3. North South University Dhaka Bangladesh
4. Bangabandhu Sheikh Mujib Medical University Dhaka Bangladesh
5. Sher‐e‐Bangla medical college hospital Barishal Bangladesh
6. Dr Sirajul Islam Medical College and Hospital Dhaka Bangladesh