Conflict of interest
FRANK
Xiaoxin Shi declares that she has no conflicts of interest. Frank Lobbezoo is a member of the Academic Advisory Boards for GrindCare and Oral Function of Sunstar Suisse S.A. and receives research grants from Sunstar Suisse S.A., SomnoMed, Vivisol, Health Holland, and Airway Management. Hui Chen declares that she has no conflicts of interest. Boudewijn R. A. M. Rosenmöller declares that he has no conflicts of interest. Erwin Berkhout declares that he has no conflicts of interest. Jan de Lange declares that he has no conflicts of interest. Ghizlane Aarab is a member of the Academic Advisory Board for Oral Function of Sunstar Suisse S.A. and receives research grants from Sunstar Suisse S.A., SomnoMed, Vivisol, and Health Holland.