JOURNAL OF QILU NURSING, Volume 17, Issue 33,2011, Pages 42-43, doi:10.3969/j.issn.1006-7256.2011.33.026
Journal of Anhui Agricultural Sciences, Volume 39, Issue 33,2011, Pages 20525-20527, doi:10.3969/j.issn.0517-6611.2011.33.082
WORLD HEALTH DIGEST, Volume 08, Issue 33,2011, Pages 127-128, doi:10.3969/j.issn.1672-5085.2011.33.100