CHINESE GENERAL PRACTICE, Volume 10, Issue 23,2007, Pages 2008-2009, doi:10.3969/j.issn.1007-9572.2007.23.035
JOURNAL OF NURSING SCIENCE, Volume 22, Issue 23,2007, Pages 3-5, doi:10.3969/j.issn.1001-4152.2007.23.002
OCCUPATION AND HEALTH, Volume 23, Issue 23,2007, Pages 2147-2148, doi:10.3969/j.issn.1004-1257.2007.23.009
INTERNATIONAL JOURNAL OF RESPIRATION, Volume 27, Issue 23,2007, Pages 1782-1785, doi:10.3760/cma.j.issn.1673-436X.2007.23.007
MEDICINE AND PHILOSOPHY, Volume 28, Issue 23,2007, Pages 15-16,22,