PHILADELPHIA – Doctors, nurses, and staff at private practices and clinics across Pennsylvania have been left guessing when they would get access to a COVID-19 vaccine, even as they regularly interact with patients infected with the coronavirus. Even physicians who are “on staff” with a hospital system — not on the facility’s payroll but able to access services and equipment for their patients — have largely been left out as those institutions have had free rein to determine which of their employees can have access to limited vaccine doses. “They just kind of started doing their people without...