aGastroenterology Department, Portuguese Oncology Institute of Porto, Porto

bGastroenterology Department, Hospital Garcia de Orta, Lisbon

cMEDCIDS, Faculty of Medicine, University of Porto, Porto, Portugal

Received 2 November 2021 Accepted 22 January 2022

Correspondence to Raquel Ortigão, MD, Gastroenterology Department, Portuguese Oncology Institute of Porto, Rua Dr. António Bernardino de Almeida, 4200-072 Porto, Portugal, Tel: +22 508 4000; e-mail: [email protected]