要接受拔牙治療的小孩中,下列那一類兒童患者可不必做endocarditis prophylaxis?
心室中膈缺損修補手術(surgical repair of ventricular septal defect)超過6個月
後天性心瓣膜不全(acquired valvar dysfunction)
人工心瓣膜(prosthetic cardiac valves)
發紺性先天性心臟病(cyanotic congenital heart disease)