Orvar Swenson
... that Orvar Swenson performed the first successful surgery to treat Hirschsprung's disease, a birth defect which causes megacolon?
... that <b id="mwAYE"><a href="./Orvar_Swenson" id="mwAYI" rel="mw:WikiLink" title="Orvar Swenson">Orvar Swenson</a></b> performed the first successful surgery to treat <a href="./Hirschsprung's_disease" id="mwAYM" rel="mw:WikiLink" title="Hirschsprung's disease">Hirschsprung's disease</a>, a birth defect which causes <a href="./Megacolon" id="mwAYQ" rel="mw:WikiLink" title="Megacolon">megacolon</a>?