“…Samples have included a transgender adult (Sodersten, Hertegard, Larsson, & Holmberg, 2009), adults with Parkinson's disease (Boudreaux, 2011), adults with and without dysphonia (Hillman, Heaton, Masaki, Zeitels, & Cheyne, 2006), opera students (Schloneger, 2011), student teachers (Franca, 2013) and classroom and music teachers (Gaskill, O'Brien, & Tinter, 2012;Morrow & Connor, 2011a, 2011bNacci et al, 2013). Participants in these studies wore the APM for differing lengths of time ranging from 1 to 10 days for 5-15 h per day.…”