[1] Dow Univ Hlth Sci, Inst Biomed Sci, Karachi, Pakistan
[2] Dow Univ Hlth Sci, Dow Int Med Coll, Dept Biochem, Karachi, Pakistan
[3] Dow Univ Hlth Sci, Dow Int Med Coll, Dept Neurol, Karachi, Pakistan
[4] Dow Univ Hlth Sci, Dept Publ Hlth, Karachi, Pakistan
[5] Karachi Med & Dent Coll, Karachi, Pakistan