The book 生命不死(reincarnation) was written by a doctor who is a
Christian. He did not believe in reincarnation as he is a Christian
but as a doctor, he came across many cases of patients whose
illnesses got to do with their past lifes. There was a case
which his patients who were White Americans, they spoke ancient
Chinese （文言文）when they were being hypnotised. He said he has to
face the fact that reincarnation is true and he accepted the fact
and decided to write a book on reincarnation.
He noticed that there were many illnesses of his patients
related to their past lifes. By understanding more about his
patients' past lifes, he was able to cure them more
effectively.
There are other doctors who encounter patients who could relate
to their past lifes when they were hypnotised but they did not
discuss openly for fear of misunderstanding.
This doctor decided to write a book and revealed what he had
encountered.
http://www.youtube.com/watch?v=k5K2dTWlw0o