Months before he turned 17, Justin Bieber had courageously admitted to host of "Today Show", Matt Lauer that his voice is changing, adding that he has hired a voice tutor to help him deal with the changes. Michael died at 51 in 2009, yet his voice sounded more like how he did sound when he was Justin Bieber’s age.

Ever wonder why Michael Jackson’s tiny, childlike and boyish sounding like voice, whom millions of fans cry for as seen when cameras panned over them during his performances?

A doctor from France , Alain Branchereau may have the answer in his upcoming book entitled, "Michael Jackson, the secret of a voice".

The vascular surgeon from France and whose only strong connection with music is great interests in opera said that his book revealed how Michael Jackson’s tiny voice even as an adult may have resulted from the ‘chemical castration’ that he has gone through as a child.

"When he died, I realised that he was an unusual phenomenon," Alain Branchereau was quoted as saying by the Agence France Presse. Branchereau works for Timone University Hospital in France's Mediterranean port of Marseille.

"I said, 'That's the voice of a castrato!',” he added, explaining how his realization became a great motivation for him to write a book about it, zeroing on Michael Jackson as his case study.

In his research, the opera buff told AFP how he found out that Jackson was greatly exposed to synthetic anti-male hormone drug, called cyproterone.The drug was used, he added, to treat his worsening acne when he was a child.

"When he was 12, Michael Jackson had acne. We know this, he spoke about it himself as a tragedy. What I think could have happened is that his people suggested this miracle treatment," the doctor said, according to AFP.

The miracle treatment however had had other impact on the singer's voice.

Cyproterone, he explained "blocks puberty, the voice can't mature". He said, noted AFP that the drug prevents growth of bodily hair and the larynx. Citing almost 20 books which he asserted he read on the subject, Dr. Branchereau insisted that cyproterone has also its effects on the bones, leaving the body with a slight frame but a large chest.

The doctor was quick to concede however, that he has never spoken about his theory on the matter to any member of his family, underscoring that he may never have proof unless someone comes out in the open and confirm his assumption.

More of his hypotheses can be found in the book officially out on March 9.

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