Fecal Viral Concentration and Diarrhea in Norovirus Gastroenteritis oleh Nelson Lee, Martin C.W. Chan, Bonnie Wong, K.W. Choi, Winnie Sin, Grace Lui, Rickjason C. W. Chan, Raymond W.M. Lai, C.S. Cockram, Joseph J.Y. Sung, Wai K. Leung