1. Operations Research Center and Sloan School of Management, Massachusetts Institute of Technology, Cambridge, MA, USA
2. Alexandria Health, Cambridge, MA
3. Alexandria Health, Providence, RI, USA
4. Operations Research Center, Massachusetts Institute of Technology, Cambridge, MA, USA
5. Department for Pediatric Cardiothoracic Surgery, Children’s Memorial Health Institute, Warsaw, Poland
6. Hospital de Santa Marta and NOVA University, Lisbon, Portugal
7. Athens Heart Surgery Institute, Greece