[1] Thiruvananthapuram Med Coll, Child Dev Ctr, Thiruvananthapuram 695011, Kerala, India
[2] Govt Med Coll, Clin Epidemiol Resource Training Ctr, Thiruvananthapuram, Kerala, India
[3] Christian Med Coll & Hosp, Dept Psychiat, Child & Adolescent Psychiat Unit, Vellore, Tamil Nadu, India