IOWA CITY, Iowa (AP) — As the nation’s COVID-19 vaccination campaign accelerates, governors, public health directors and committees advising them are holding key discussions behind closed doors, including debates about who should be eligible for the shots and how best to distribute them. A review by The Associated Press finds that advisory committees created to help determine how to prioritize vaccine doses have been holding private meetings in at least 13 states that are home to more than 70 million people. In at least 15 other states, such meetings are open to the public. But even in those states, governors and health officials can modify or override committee recommendations with little or no public explanation.