sentences:  The study also noted that the number of concierge dental and pediatric practices increased markedly since February 2009.In 2004, the Government Accountability Office counted 146 such practices, mostly concentrated on the US east and west coasts with practices such as MDVIP, 1 on 1 MD, and Signature MD being among the oldest.the American Medical Association did not track the number of concierge practices because the concept was so new.