IOWA CITY — The University of Iowa Hospitals and Clinics is strengthening its internal controls after a state auditor’s investigation found one of its former orthopedic surgeons diverted nearly $1.9 million in collections from the institution over 15 years.Brian David Adams, 58, of Iowa City, is accused of depositing the diverted money into personal bank accounts, according to a report released Thursday on the special investigation into UIHC and its Department of Orthopedics and Rehabilitation from July 1, 1999 through Dec.