[1] Univ Santiago de Compostela, Oral Med Oral Surg & Implantol Unit, Fac Med & Odontol, Rua Entrerrios S-N, Santiago De Compostela 15782, Spain
[2] Hlth Res Inst Santiago de Compostela IDIS, GI 1319 Res Grp, Santiago De Compostela, Spain
[3] Univ S Florida, Coll Publ Hlth, Tampa, FL USA
[4] Univ S Florida, Chiles Ctr, Coll Publ Hlth, Tampa, FL USA