Midwives, nurse practitioners, physician assistants and other non-doctors do as good a job as MDs in the care they deliver — and patients often like them better, a World Health Organization team reported on Thursday. Between 1998 and 2010, the number of Medicare patients treated by NPs increased 15-fold to more than 450,000 people, UTMB researchers found recently. Groups such as the American Association of Nurse Practitioners are calling for even more to be trained.