[1] Heilongjiang Univ Chinese Med, Affiliated Hosp 2, Dept Acupuncture & Moxibust, Harbin 150040, Heilongjiang Pr, Peoples R China
[2] Harbin Med Univ, Sch Publ Hlth, Dept Biostat, Harbin, Peoples R China
[3] Heilongjiang Univ Chinese Med, Sch Acupuncture & Moxibust, Dept Acupuncture & Moxibust, Harbin 150040, Heilongjiang Pr, Peoples R China
[4] Heilongjiang Univ Chinese Med, Affiliated Hosp 1, Div CT & MRI, Harbin 150040, Heilongjiang Pr, Peoples R China
[5] Stanford Univ, Dept Hlth Res & Policy, Stanford, CA 94305 USA