Fig. 7.

a The strut has been covered as observed by optical coherence tomography and at low magnification by hematoxylin and eosin (HE) staining. Black rectangles in the left image represent the area of the right image that the covering was endothelial cells in high magnification; b The strut has been covered as observed by optical coherence tomography and at low magnification by hematoxylin and eosin staining. Black rectangles in the left image represent the area of the right image that the covering was not endothelial cells in high magnification; c The strut has not been covered as observed by optical coherence tomography and at low magnification with hematoxylin and eosin staining. Black rectangles in the left image represent the area of the right image that the covering was not endothelial cells in high magnification; d The strut has been covered as observed at low magnification with hematoxylin and eosin staining, but black rectangles in the left image represent the area of the right image that the covering was not exactly the same