C. Kalita, A. Sarma, J. D. Sharma, M. Kalita, M. Krishnatreya, and A. C. Kataki, “Correlation between ABO blood groups and various cancers in the north eastern region of India: a retrospective observational study”, Int J Res Med Sci, vol. 6, no. 11, pp. 3643–3646, Oct. 2018.