Relationship between serum gamma-glutamyl transferase level and colorectal adenoma. oleh Tzu-Chan Hong, Hung-Chih Yang, Chi-Ling Chen, Jia-Horng Kao, Chun-Jen Liu, Ming-Jen Chen, Horng-Yuan Wang, Yang-Che Kuo, Lo-Yip Yu, Kuang-Chun Hu