Survey on passive smoking and influence factors among 2 246 primary school students in Shandong Province.
TIAN Huan, TIAN Tian, LI Jun, ZHANG Wei, HU Yu, ZONG Shuang.
journal1 . 2015, (5): 511 -514 .  DOI: 10.11852/zgetbjzz2015-23-05-21