AV_Stanford-DF_01 AV_Stanford-DF_02 AV_Stanford-DF_03 AV-calc_Stanford-DF_01 CT_CALC_VALVE bioprosthesis stented AV_Stanford-DF_04 AV_Stanford-DF_05 Root_Stanford_DF_01 AV_Stanford-DF_09 CABG CTA_2 skin AV_mechanical