article_snippet: It works on a simple swapping principle but takes It to a much higher level, according to California Pacific Medical Center in San Francisco.
article_snippet: Here's how the super swap works, according to California Pacific Medical Center in San Francisco.
article_snippet: Such long-chain transplanting is rare.
article_snippet: Such long-chain transplanting's been done before, California Pacific Medical Center said in a statement, but matching up the people in the chain has been laborious and taken a long time.