Laryngeal evidence for the first and second passaggio in professionally trained sopranos - Echternach, Matthias; Burk, Fabian; Köberlein, Marie; Selamtzis, Andreas; Döllinger, Michael; Burdumy, Michael; Richter, Bernhard; Herbst, Christian Thomas (Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2017)