With two transplanted lungs and a record-setting medical history, Tim McClellan inspires both his family and the doctors who treat him.The 24-year-old waiter, recovering in an intensive-care wing at the University of Maryland Medical Center, can barely talk, mouthing words that require lip reading to understand him. But he can hear, nod slightly, sit up in a chair - and he knows the machinery attached to him is monitoring his vital signs.
