11.   Princess Diana once asked heart transplant pioneer Dr. Christiaan Barnard to help her and her sweetheart move to South Africa, Barnard said.

12.   South African heart transplant pioneer Christiaan Barnard dies.

13.   Thirty years later, heart transplant pioneer did not expect fame.

n. + pioneer >>共 154
industry 6.74%
aviation 5.62%
heart 4.87%
computer 4.12%
transplant 3.75%
software 2.25%
technology 1.50%
peace 1.50%
bluegrass 1.50%
browser 1.50%
heart + n. >>共 373
surgery 15.46%
problem 13.92%
trouble 7.61%
condition 6.20%
operation 4.41%
ailment 4.09%
transplant 3.37%
patient 2.95%
muscle 2.90%
rhythm 2.10%
pioneer 0.22%
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