1 Department of Mechanical Engineering, Faculty of Engineering of the University of Porto, Porto, Portugal; Institute of Science and Innovation in Mechanical and Industrial Engineering, Porto, Portugal.
2 WGO Gastroenterology and Hepatology Training Center, Porto, Portugal; Faculty of Medicine of the University of Porto, Porto, Portugal.
3 Department of Gastroenterology, São João University Hospital, Porto, Portugal; WGO Gastroenterology and Hepatology Training Center, Porto, Portugal; Faculty of Medicine of the University of Porto, Porto, Portugal.