Twenty blood donors were selected from about 100 applicants in a unit for medical examination
The least likely to be selected are those who have donated blood since 1993 or who have failed a blood donation check-up since 1995
Da Chen last donated blood in 1992, when he had his leg amputated because of a public injury, and blood from voluntary blood donors was flowing through his blood vessels. 'I have more reason than anyone to have blood,' he said