This story has been made freely available as a public service to our readers. Please consider supporting SCMP’s journalism by subscribing. Hong Kong’s Hospital Authority has issued an urgent appeal for a heart and lung donation to save a critically ill 13-year-old girl. The patient, Ching Ching, suffers from pulmonary hypertension and heart failure. She is currently being kept alive at Hong Kong Children’s Hospital with the support of an extracorporeal membrane oxygenation or ECMO machine,...