Quantification of bufadienolides in Bryophyllum pinnatum leaves and manufactured products by UHPLC-ESIMS/MS - Oufir, M; Seiler, C; Gerodetti, M; Gerber, J; Fürer, K; Mennet-von Eiff, M; Elsas, S M; Brenneisen, R; von Mandach, U; Hamburger, M; Potterat, O (Planta Med, 2015)