Barnett, S; Nair, N; Tripathy, P; Borghi, J; Rath, S; Costello, A; (2008) A prospective key informant surveillance system to measure maternal morality - findings from indigenous populations in Jharkhand and Orissa, India. BMC Pregnancy and Childbirth , 8 , Article 6. 10.1186/1471-2393-8-6. Green open access