WORLD HEALTH DIGEST, Volume 6, Issue 28,2009, Pages 156, doi:10.3969/j.issn.1672-5085.2009.28.162
MANAGEMENT & TECHNOLOGY OF SME, , Issue 28,2009, Pages 138, doi:10.3969/j.issn.1673-1069.2009.28.117
CONTEMPORARY MEDICINE, Volume 15, Issue 28,2009, Pages 131, doi:10.3969/j.issn.1009-4393.2009.28.109
WORLD HEALTH DIGEST, Volume 6, Issue 28,2009, Pages 221-222, doi:10.3969/j.issn.1672-5085.2009.28.246