| 
					
						|  |  
    					|  |  
    					| Relationship between Endoscopic Morphological Characteristics and Pathological Types of Colorectal Polyps under Gas Injection and Water Injection Colonoscopy |  
						| ZHAI Chunying, KE Xiaoli, XU Yaohua, CHENG Xiaohe, QIU Yu |  
						| First-author's address: Beijing Puren Hospital, Beijing 100062, China |  
						|  |  |