[1] Univ Groningen, Univ Med Ctr Groningen, Dept Pulm Dis, Groningen Res Inst Asthma & COPD GRIAC, Groningen, Netherlands
[2] Univ Groningen, Univ Med Ctr Groningen, Dept Oral & Maxillofacial Surg, Groningen, Netherlands
[3] Univ Amsterdam, MOVE Res Inst Amsterdam, Dept Oral Kinesiol, Acad Ctr Dent Amsterdam ACTA, Amsterdam, Netherlands
[4] Vrije Univ Amsterdam, Amsterdam, Netherlands
[5] Acad Med Ctr, Dept Oral & Maxillofacial Surg, Amsterdam, Netherlands
[6] Tjongerschans Hosp, Dept Oral & Maxillofacial Surg, Heerenveen, Netherlands
[7] Martini Hosp, Dept Ear Nose & Throat Surg, Groningen, Netherlands