SCIENCE AND TECHNOLOGY INNOVATION HERALD, , Issue 32,2009, Pages 246-247, doi:10.3969/j.issn.1674-098X.2009.32.204
CHINESE JOURNAL OF MODERN NURSING, Volume 15, Issue 32,2009, Pages 3345-3347, doi:10.3760/cma.j.issn.1674-2907.2009.32.002
CHINESE JOURNAL OF POSTGRADUATES OF MEDICINE, Volume 32, Issue 32,2009, Pages 27-29, doi:10.3760/cma.j.issn.1673-4904.2009.32.011