[1] Newcastle Univ, Inst Hlth & Soc, Newcastle Upon Tyne NE2 4BW, Tyne & Wear, England
[2] Newcastle Univ, Ctr Oral Hlth Res, Newcastle Upon Tyne NE2 4BW, Tyne & Wear, England
[3] Univ Minnesota, Sch Dent, Div TMD & Orofacial Pain, Minneapolis, MN 55455 USA
[4] Univ Minnesota, Sch Publ Hlth, Div Epidemiol, Minneapolis, MN 55455 USA
[5] Univ Minnesota, Sch Med, Dept Neurol, Minneapolis, MN 55455 USA
[6] HealthPartners Res Fdn, Minneapolis, MN USA