Editor's note: After publication of this article on Tuesday, Mayo Clinic and other sources provided additional information, which has been included. An earlier version of this story incorrectly ...

In 1938, the Mayo Clinic faced its greatest challenge when Sister Joseph Dempsey, Dr. Charlie, and Dr. Will all died within a few months of each other. In spite of the passing all three leaders ...

The Mayo Clinic is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV ...