Endodrill is a newly constructed biopsy tool for flexible endoscopic use. It uses a drilling motion within a casing to harvest solid biopsies from tissue through the biopsy channel of a conventional flexible endoscope. It was originally designed for sampling of tissue from submucosal lesions. The investigators first study of the instrument is now finished. Endodrill is safe to use and generates more submucosal tissue compared to biopsies with a conventional biopsy forceps.