Rajesh Khanna*, N Karikalan, Anil Kumar Mishra, Anchal Agarwal, Madhulekha Bhattacharya and Jayanta K Das
* Corresponding author: Rajesh Khanna rkhanna_dr@yahoo.com
BMC Public Health 2013, 13:2 doi:10.1186/1471-2458-13-2
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