Chattopadhyay C, Chakrabarti N, Chatterjee M, Mukherjee S, Sarkar K, A Chaudhuri R. Black Tea (Camellia sinensis) Decoction Shows Immunomodulatory Properties on an Experimental Animal Model and in Human Peripheral Mononuclear Cells. Pharmacognosy Research. 2012;4(1):15-21.