1. Madonna della Pietá by Michelangelo
Margaret R. Wentz, BA 
Mayo Clinic Proceedings 
Volume 93, Issue 5, (May 2018)
DOI: /j.mayocp
Copyright © 2018 Mayo Foundation for Medical Education and Research Terms and Conditions

2. Mayo Clinic Proceedings 2018 93, DOI: (10.1016/j.mayocp.2018.03.009)
Copyright © 2018 Mayo Foundation for Medical Education and Research Terms and Conditions

3. Mayo Clinic Proceedings 2018 93, DOI: (10.1016/j.mayocp.2018.03.009)
Copyright © 2018 Mayo Foundation for Medical Education and Research Terms and Conditions