Anees Ahmad,1 Syed Zulfequar Ahmad,2 Najam Khalique,1 Mohammad Ashraf,3 Yasir Alvi4
1 Department of Community Medicine, J.N. Medical College, AMU, Aligarh, India
2 Department of C.G.H.S., Lucknow, India
3 Department of Ophthalmology, J.N. Medical College, AMU, Aligarh, India
4 Department of Community Medicine HIMSR, Hamdard Univerisity New Delhi