This article of Nodo-News is a personal opinion and review by Shigeki Aida. Who has researched the human voice, and hands on examined the larynx of over 16,000 people. The content of provided is medically unverified. Therefore, please note that we shall not be responsible for any losses or damages. Everything is taken at your own risk. Also, please understand that we cannot reply to all emails or questions regarding grammar and spelling errors.