JOURNAL OF NURSES TRAINING, Volume 24, Issue 21,2009, Pages 1947-1949, doi:10.3969/j.issn.1002-6975.2009.21.011
SHANDONG MEDICAL JOURNAL, Volume 49, Issue 21,2009, Pages 104-105, doi:10.3969/j.issn.1002-266X.2009.21.070
JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY, Volume 30, Issue 21,2009, Pages 2462-2464, doi:10.3321/j.issn:1000-2790.2009.21.059
JOURNAL OF ANHUI AGRICULTURAL SCIENCES, Volume 37, Issue 21,2009, Pages 10109-10111, doi:10.3969/j.issn.0517-6611.2009.21.183