An Aiken County jury returned a $13.75 million verdict Wednesday against Aiken Regional Medical Centers in a case in which a woman lost both legs above the knee, her left arm below the elbow and the tips of her fingers on her right hand. The jury found the hospital was “grossly negligent or reckless, willful or wanton in its acts or omissions” in the case of Seletha Gartrell, a 54-year-old …