Gaceta Sanitaria

ITC EUREST-PLUS Spain: protocol of a prospective longitudinal study of smokers in Spain Marcela Fu; Yolanda Castellano; Olena Tigova; Pete Driezen; Mary E. Thompson; Susan C. Kaai; Anne C.K. Quah; Geoffrey T. Fong; Constantine I. Vardavas; Esteve Fernández;