Hong Kong health authorities have made an urgent appeal for a heart transplant for a six-month-old boy in a critical condition, saying the Hospital Authority will also seek assistance from mainland China soon.An authority spokesman said on Tuesday evening that six-month-old Rufus, who suffers from dilated cardiomyopathy and is in the paediatric intensive care unit at Hong Kong Children’s Hospital, urgently needed a heart transplant.“Given the critical condition of the patient, in addition to...