[1] Christian Med Coll & Hosp, Dept Neurol Sci, Vellore, Tamil Nadu, India
[2] Christian Med Coll & Hosp, Dept Child Hlth, Vellore, Tamil Nadu, India
[3] Christian Med Coll & Hosp, Dept Med Genet, Vellore 632004, Tamil Nadu, India
[4] Christian Med Coll & Hosp, Dept Radiodiag, Vellore, Tamil Nadu, India
[5] Kennedy Krieger Inst, Biochem Genet Lab, Baltimore, MD USA