[1] Khyber Teaching Hosp, Internal Med, Peshawar, Pakistan
[2] Near East Univ Hosp, Internal Med, Nicosia, Cyprus
[3] Gen Hosp Odan Lagos, Internal Med, Lagos, Nigeria
[4] Liaquat Univ Med & Hlth Sci, Internal Med, Jamshoro, Pakistan
[5] Obafemi Awolowo Univ, Med & Surg, Ife, Nigeria
[6] Midwest Sleep & Wellness Clin, Internal Med, Chicago, IL 60611 USA
[7] Chattogram Med Coll Hosp CMCH, Med, Chittagong, Bangladesh
[8] Liaquat Natl Hosp, Med & Surg, Karachi, Pakistan
[9] Med Coll, Karachi, Pakistan
[10] Augusta Univ, Neurol, Augusta, GA USA
[11] Allama Iqbal Med Coll, Med, Lahore, Pakistan
[12] Mt Sinai Hosp, Internal Med, Brooklyn, NY USA
[13] Mayo Hosp, Internal Med, Lahore, Pakistan