A coronavirus patient from China has left hospital after the longest-ever stay on a controversial life support machine, according to media reports.The 62-year-old man spent 111 days on an extracorporeal membrane oxygenation (ECMO) machine, almost twice as long as previous patients. He was discharged from a hospital in Guangzhou last week, according to state news agency Xinhua.The treatment was pioneered in the 1970s to treat babies in intensive care, but its use on adults has proved…