[1] Sree Chitra Tirunal Inst Med Sci & Technol, Achutha Menon Ctr Hlth Sci Studies, Trivandrum, Kerala, India
[2] Sree Chitra Tirunal Inst Med Sci & Technol, Achutha Menon Ctr Hlth Sci Studies, Quit Tobacco India Project, Trivandrum 695012, Kerala, India
[3] Indian Inst Diabet, Trivandrum, Kerala, India
[4] Med Trust Hosp, Pathanamthitta, Kerala, India
[5] Univ Arizona, Sch Anthropol, Tucson, AZ USA