Presidential Physician: James C. Cain
- Was a cardiologist at the Mayo Clinic when Johnson had his 1955 heart attack. Cain, along with J. Willis Hurst and Howard Burchell, consulted on Johnson's case.
- Cain and Hurst remained Johnson's cardiologists for the next 18 years.
- Anonymous. "Past & President: J. Willis Hurst and LBJ." Emory Medicine Magazine. pp 28-33, Autumn 1996. On-line at emory.edu.
- Hurst, J. Willis; Cain, James C. LBJ: To Know Him Better. (?)Austin, TX: LBJ Foundation, 1995. 78 pages.