The International BVFP Registry - Guntinas-Lichius, O; Hagen, R; Müller, A; Gugatschka, M; Pototschnig, C; Zorowka, P; Yaremchuk, S; Grosheva, M; Maurer, JT.; Kölmel, Jan-Constantin; Schneider-Stickler, B; Nawka, T (Laryngo-Rhino-Otologie, 2020)