<prompt> Umusho 1: Ngo - 1999, uRobert Kottwitz wasungula inkolelo-mbono ye - endoscopy ephendukile noShelstad. Ngo-2008 - 9 waqeda ukusebenza nge-endoscopy ethambile. Umusho 2: Ngo-1999, uShelstad, kanye noRobert Kottwitz, basungula inkolelo-mbono ye-endoscopy ephikisiwe futhi baqedela umsebenzi we-endoscopy ethambile ngo-2008 - 9. Umbuzo: Ingabe umusho 1 nomusho 2 usho into efanayo? Yebo noma Cha?  <response>: Cha, akunjalo. 