we created four experimental groups to ( 1 ) determine flap survival without blood supply , ( 2 ) establish efficacy of microvascular anastomosis , ( 3 ) test an end-to-end av fistula , and ( 4 ) test an end-to-side fistula that was converted after one week to an end-to-end version .
C0003855
av fistula
C0016169
fistula