Vaidya S, Kundra P, Gopalakrishnan S, Parida P, Yuvaraj K, Mohan PM. J Voice. 2016 Sep;30(5):631-7
90 adult patients were randomly assigned to LMA Proseal and i-gel groups, with voice evaluated using perceptive and acousitc analysis. In both groups voice results deteriorated comparably.
Link to abstract