Risk factors for head and neck cancer in young adults: a pooled analysis in the INHANCE consortium - Toporcov, Tatiana Natasha; Znaor, Ariana; Zhang, Zuo-Feng; Yu, Guo-Pei; Winn, Deborah M.; Wei, Qingyi; Vilensky, Marta; Vaughan, Thomas; Thomson, Peter; Talamini, Renato; Szeszenia-Dabrowska, Neonila; Sturgis, Erich M.; et al. (International Journal of Epidemiology, 2015)