The use of the cap and underwater technique as an aid in endoscopic diagnosis and treatment of upper gastrointestinal bleeding: case series oleh Fernando Lander Mota, MD, Deborah Marques Centeno, MD, Fernando J.S. de Oliveira, MD, Eduardo M.A. Pereira, Jr., MD, Sarah Madeira Jacinto, MD, Pedro H.A. F. Cardoso, MD, Savério T.N. Armellini, MD, Marco Aurélio D’Assuncao, MD