1. Theoretical and Applied Mechanics Program, McCormick School of Engineering Northwestern University Evanston Illinois USA
2. Kenneth C. Griffin Esophageal Center of Northwestern Medicine, Division of Gastroenterology and Hepatology, Department of Medicine Northwestern University Chicago Illinois USA
3. Division of Gastroenterology, Department of Medicine Mayo Clinic Jacksonville Florida USA
4. Division of Biostatistics, Department of Preventive Medicine, Feinberg School of Medicine Northwestern University Chicago Illinois USA
5. Department of Gastroenterology Hospital Clínic de Barcelona Barcelona Spain
6. Department of Mechanical Engineering, McCormick School of Engineering Northwestern University Evanston Illinois USA