1. Department of Medicine, B G Clinic and Maternity Nursing Home, Sarika Vihar, Deenpur, Delhi, India
2. Department of Obstetrics and Gynecology, B G Clinic and Maternity Nursing Home, Sarika Vihar, Deenpur, Delhi, India
3. Department of Medicine, Netaji Subhas Medical College & Hospital, Patna, Bihar, India,