The book was a 20-year project of a prominent Nazi and doctor, Eduard Pernkopf, who rose through the academic ranks in Austria thanks to his support for Adolf Hitler's party.
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Dr Mackinnon says nothing else "even begins to compare" to the book's accuracy and detail, and it is particularly useful for complex surgeries because it helps her "figure out which of the many small nerves that course through our body are potentially causing the pain".