Hello,
I believe that I can do this project well for you. Firstly, I am a licensed physician in the US that works in a teaching hospital that is associated with a research center. I have access to several otolaryngologists/ENT's should your initial choices be unavailable. I think if your initial choices are contacted by an American physician they would also be more likely to consent to an interview than a non-physician, especially from outside the US.
Secondly, as a physician, I also have a strong knowledge base in sleep apnea and have read on singing therapy. I understand that it has been used with some impressive success in teaching stroke patients how to re-learn speech.
Thirdly, I am also sure that I can write your paper in as simple a way as you would like it. Part of my job entails having to simplify things when I explain them to patients whose educational levels range anywhere from middle school to postgraduate. I have often been told that I do a very good job at explaining difficult concepts in an easy and non-threatening manner.
I understand this is a ghost writer assignment and not looking for any recognition in your paper.
I look forward to your response and hope we can begin soon as this sounds like an interesting project. Thank you.