Mukherjee, Monoj, and Siddhartha Das. 2019. “Efficacy and Safety of Duckbill Valve Voice Prosthesis in Comparison to Provox”. Bengal Journal of Otolaryngology and Head Neck Surgery 27 (2). Kolkata, India:149-53. https://doi.org/10.47210/bjohns.2019.v27i2.242.