A former coronavirus disease (COVID-19) patient who underwent lung transplant surgery, takes a remedial exercise at Hallym Sacred Heart Hospital ECMO Center in Anyang, South Korea, July 1, 2020. fter a record 112 days on a specialised life-support system, a South Korean COVID-19 patient is recovering from double lung transplant surgery, doctors say, in only the ninth such procedure worldwide since the coronavirus outbreak began. Hallym Sacred Heart Hospital ECMO Center/Handout via REUTERS

A damaged lung of a coronavirus disease (COVID-19) patient is pictured at Hallym Sacred Heart Hospital ECMO Center in Anyang, South Korea, June 22, 2020. The 50-year-old woman was diagnosed with the disease and hospitalised in late February and then spent 16 weeks on extracorporeal membrane oxygenation (ECMO) support, which involves circulating a patient's blood through a machine that adds oxygen to red blood cells. Hallym Sacred Heart Hospital ECMO Center/Handout via REUTERS

A damaged lung of a coronavirus disease (COVID-19) patient is pictured at Hallym Sacred Heart Hospital ECMO Center in Anyang, South Korea, June 22, 2020. Hallym Sacred Heart Hospital ECMO Center/Handout via REUTERS

Health workers check a coronavirus disease (COVID-19) patient at Hallym Sacred Heart Hospital ECMO Center in Anyang, South Korea, March 5, 2020. Hallym Sacred Heart Hospital ECMO Center/Handout via REUTERS

The ECMO machine is seen next to a coronavirus disease (COVID-19) patient at Hallym Sacred Heart Hospital ECMO Center in Anyang, South Korea, July 1, 2020. Hallym Sacred Heart Hospital ECMO Center/Handout via REUTERS