Randomized, placebo-controlled, esophageal squamous cell cancer chemoprevention trial of selenomethionine and celecoxib

Paul J. Limburg, Wenqiang Wei, Dennis J. Ahnen, Youlin Qiao, Ernest T. Hawk, Guoqing Wang, Carol A. Giffen, Guiqi Wang, Mark J. Roth, Ning Lu, Edward L. Korn, Yurong Ma, Kathleen L. Caldwell, Zheiwei Dong, Philip R. Taylor, Sanford M. Dawsey