i remember reading another report by washington post on this issue a year ago...i am posting the report link here and perhaps it could provide us with a bit more details regarding the problem...

  news title: China used to harvest organs from prisoners. 
              Under pressure, that practice is 
              finally ending. 
  date: 2017/09/14

https://www.washingtonpost.com/world/asia_pacific/in-the-fac...