1. Knight Cardiovascular Institute, Oregon Health and Science University, Portland, OR, USA
2. Sulpizio Cardiovascular Center, University of California San Diego, La Jolla, CA, USA
3. Saint Luke’s Mid America Heart Institute, University of Missouri-Kansas City, Kansas City, MO, USA
4. The Heart Hospital, Baylor Scott and White, Plano, TX, USA
5. Minneapolis Heart Institute, Abbott Northwestern Hospital, Minneapolis, MN, USA