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Learning curves. (A) For all 300 consecutive operations; (B,C,D) for the first 100 procedures of subgroups defined based on (B) tercile, (C) type of construct, (D) and hybrid versus non-hybrid procedures. Type of construct was subdivided into procedures including (I) SIMA +1 distal anastomosis, (II) SIMA +2 distal anastomoses, and (III) BIMA or more than 2 distal anastomoses. SIMA, single internal mammary artery; BIMA, bilateral internal mammary artery.
