DNA physicians are Medical Directors at a majority of the hemodialysis facilities in the Dallas area and at outlying facilities in Greenville, Athens, Terrell, Grapevine and Waxahachie.  They are responsible for the supervision and management of end-stage renal disease patients who receive hemodialysis treatments including in-center staff-assisted patients; continuous ambulatory peritoneal dialysis patients; home-trained hemodialysis patients; and continuous cycling peritoneal dialysis patients.