Erratum to: Noticing cigarette health warnings and support for new health warnings among non-smokers in China: findings from the International Tobacco Control project (ITC) China survey - Zejun Li; Tara Elton-Marshall; Geoffrey T. Fong; Anne Chiew Kin Quah; Guoze Feng; Yuan Jiang; Sara C. Hitchman (BMC, 2017)