[1] Univ Appl Sci, Fac Business Management & Social Sci, Sect Speech & Language Therapy, Osnabruck, Germany
[2] SRH Tech Coll Speech & Language Therapy, Bonn, Germany
[3] Univ Ulm, Dept Otorhinolaryngol, Sect Phoniatr & Pedaudiol, Ulm, Germany
[4] HAWK Univ Appl Sci & Arts, Fac Social Work & Hlth, Hildesheim, Germany