About 400 health care and religious leaders are meeting in St. Louis to talk about how religion can play a role in health care. The National Insitutes of Health in Atlanta says its studies, and studies at various medical schools, show a person’s health can be positively affected by their religious beliefs. Conference organizers say that in the past few years, more mainline medical schools have offered courses on the ties between healing and religion. Until recently, such courses had been offered only in medical schools sponsored by religious denominations.