1 Department of Prevention, Nankai Hospital, Tianjin Academy of Integrative Medicine, Tianjin, 300100 China.
2 Department of Gastroenterology, Nankai Hospital, Tianjin Academy of Integrative Medicine, Tianjin, 300100 China.
3 3Laboratory of Anatomy, School of Integrative Medicine, Tianjin University of Traditional Chinese Medicine, No. 88 Yu Quan Road, Nankai District, Tianjin, 300193 China.