SCI/TECH INFORMATION DEVELOPMENT & ECONOMY, Volume 17, Issue 25,2007, Pages 32-34, doi:10.3969/j.issn.1005-6033.2007.25.017
MATERNAL AND CHILD HEALTH CARE OF CHINA, Volume 22, Issue 25,2007, Pages 3496-3498, doi:10.3969/j.issn.1001-4411.2007.25.011
CHINA MEDICAL HERALD, Volume 4, Issue 25,2007, Pages 167-168, doi:10.3969/j.issn.1673-7210.2007.25.124
WORLD JOURNAL OF GASTROENTEROLOGY, Volume 13, Issue 25,2007, Pages 3493-3499,
NATIONAL MEDICAL JOURNAL OF CHINA, Volume 87, Issue 25,2007, Pages 1734-1737, doi:10.3760/j:issn:0376-2491.2007.25.002