THE JOURNAL OF PRACTICAL MEDICINE, Volume 24, Issue 21,2008, Pages 3671-3673, doi:10.3969/j.issn.1006-5725.2008.21.018
CHINESE GENERAL PRACTICE, Volume 11, Issue 21,2008, Pages 1989, doi:10.3969/j.issn.1007-9572.2008.21.033
JOURNAL OF COMMUNITY MEDICINE, Volume 6, Issue 21,2008, Pages 32-33, doi:10.3969/j.issn.1672-4208.2008.21.017