CHINESE NURSING RESEARCH, Volume 18, Issue 24,2004, Pages 2170-2171, doi:10.3969/j.issn.1009-6493.2004.24.004
JOURNAL OF PRACTICAL MEDICAL TECHNIQUES, Volume 11, Issue 24,2004, Pages 2681-2682, doi:10.3969/j.issn.1671-5098.2004.24.057
MATERNAL AND CHILD HEALTH CARE OF CHINA, Volume 19, Issue 24,2004, Pages 104-106, doi:10.3969/j.issn.1001-4411.2004.24.064