“…Early clinical research reported single subject case studies (Bralley, Bull, Gore, & Edgerton, 1978;Hooper, 1985;Kalra, 1977;Kaye, Bortz, & Toumi, 1993;Mount & Salmon, 1988;Yardley, 1976); more recently small group studies have reported outcomes of speech therapy (Byrne et al, 2003;Dacakis, 2000;Neumann et al, 2002b;Soderpalm et al, 2004) and pitch-elevating surgery (Brown, Perry, Cheesman, & Pring, 2000;de Jong, 2003;Gross, 1999;Kunachak, Prakunhungsit, & Sujjalak, 2000;Neumann et al, 2002b;Wagner, Fugain, Monneron-Girard, Cordier, & Chabolle, 2003;Yang et al, 2002). However, further research is needed to evaluate specific techniques and protocols.…”