LUDINGTON – Memorial Medical Center’s board of directors has officially approved the officers elected by the medical staff for 2012-13. Steven Strbich, DO, is the hospital’s new chief of staff. Other officers are Bret Autrey, DO, vice chief of staff, John Persson, DO, secretary, and members-at-large David Gadzinski, MD, and Marc Keen, MD. Dr. Strbich is medical director for the…