[1] Sanjay Gandhi Mem Hosp, Med, Delhi, India
[2] Sri Balaji Act Med Inst, Med, Delhi, India
[3] Ladoke Akintola Univ Technol, Pure & Appl Biol, Ogbomosho, Nigeria
[4] Stavropol State Med Univ, Gen Med, Stavropol, Russia
[5] Jinnah Sindh Med Univ, Med, Karachi, Pakistan
[6] Liaquat Natl Hosp & Med Coll, Med, Karachi, Pakistan
[7] Fed Med Coll, Med, Islamabad, Pakistan
[8] Paolo Procacci Fdn, Pain Med, Rome, Italy
[9] Fdn Univ Med Coll, Med, Islamabad, Pakistan
[10] Shaheed Mohtarma Benazir Bhutto Med Coll, Med, Karachi, Pakistan
[11] Serv Hosp Lahore, Med, Lahore, Pakistan
[12] Lahore Med & Dent Coll, Internal Med, Lahore, Pakistan
[13] Dow Univ Hlth Sci, Internal Med Cardiol, Karachi, Pakistan
[14] Khyber Teaching Hosp, Med, Peshawar, Pakistan
[15] Khyber Teaching Hosp, Internal Med, Peshawar, Pakistan