National Academy of Osteopathy expanded to Iran and China. NAO offers a 4 months full time and a 9 months part time manual osteopathy program leading to a diploma in manual osteopathy (DMO). NAO graduates are permitted to sit for board exams administered by the Canadian Manual Osteopathy Examining Board. Upon successful completion of the board exams; NAO graduates may ... join International Osteopathic Association to receive certificates of registration that enables them to work in most countries; including Canada, USA, England, Iran, China, Brazil, India, Australia, Latvia, Costa Rica, etc.