Bruce D. Johnson, Ph.D.

Care at Mayo Clinic <svg data-name="32x32-Guides" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8 11.414L2.293 5.707 3.707 4.293 8 8.586 12.293 4.293 13.707 5.707 8 11.414z">

Health Library <svg data-name="32x32-Guides" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8 11.414L2.293 5.707 3.707 4.293 8 8.586 12.293 4.293 13.707 5.707 8 11.414z">

For Medical Professionals <svg data-name="32x32-Guides" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8 11.414L2.293 5.707 3.707 4.293 8 8.586 12.293 4.293 13.707 5.707 8 11.414z">

Research &amp; Education at Mayo Clinic <svg data-name="32x32-Guides" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8 11.414L2.293 5.707 3.707 4.293 8 8.586 12.293 4.293 13.707 5.707 8 11.414z">

Giving to Mayo Clinic <svg data-name="32x32-Guides" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 16 16"><path d="M8 11.414L2.293 5.707 3.707 4.293 8 8.586 12.293 4.293 13.707 5.707 8 11.414z">