Expectations were high during 2018 for three new migraine drugs hitting the market from Amgen Inc., Eli Lilly and Co. and Teva Pharmaceutical Industries Ltd. Priced around $7,000 each, the drugmakers called them “breakthrough” treatments designed to prevent migraines when taken year-round, and estimated that millions of patients could benefit. But a small group of medical experts who quietly advise U.S. health insurers on new drugs was not impressed, according to a private meeting held at UnitedHealth Group’s OptumRx offices in Chicago that was attended by Reuters.