1. Asaki S, Ishii N, Nishimura T, Ohara S, Yamaguchi N, Tamura T (1986) New bioptic method for submucosal tumour of the gastrointestinal tract. Tohoku J Exp Med 150: 401?406
2. Bengtsson T (1989) Population changes 2: mobility between municipalities (in Swedish). Central Bureau of Statistics for Sweden, Stockholm
3. Blackstone MO (1984) Endoscopic interpretation. Raven Press, New York, pp 158?169
4. Cotton PB (1973) Fibre-optic endoscopy and the barium meal ? results and implications. Br Med J 2: 161?165
5. Crosta C, Meroni E, Alloni R, Botti F, Carrara A, Taschieri AM (1987) Gastric submucosal neoplasms: new diagnostic and therapeutic procedures. Ital J Surg Sci 17: 131?134