“…, 1955;Winkelstein, 1957;Tuttle et al, 1960;Casten et al, 1963;Burge and Amery, 1973). Evidence has been presented that other agents may be involved (Marchand, 1955;Palmer, 1960;Cox, 1961;Squire et al, 1968;Collis, 1970;Gillison et al, 1971;Henderson et al, 1973;Stol et al, 1974). Bile, among…”