Vitamin E supplementation and in vivo immune response in healthy elderly subjects. A randomized controlled trial.
Meydani SN, Meydani M, Blumberg JB, Leka LS, Siber G, Loszewski R, Thompson C, Pedrosa MC, Diamond RD, Stollar BD. JAMA. 1997 May 7; 277(17):1380-6.