Masaki, you're a mechanical engineer? So is my daughter. She has a specialty in bio-egineering and also a masters in mechanical engineering/specialty bio-engineering. I always thought that she could have gone on to be a medical doctor and I think she considered it. But, she is in the medical field designing in the spinal divison of Medtronic. Before that, she designed hip replacements for a division of J&J. I think engineering is an excellent entry into the medical field and you are proof!