Ishikawa, N., Y. S. Sun, L. W. Nifong, G. Watanabe, and W. R. Chitwood. “How to Do It: Importance of Left Atrial Side Retraction in Robotic and Minimally Invasive Mitral Valve Surgery”. The Heart Surgery Forum, vol. 11, no. 5, Oct. 2008, pp. E270-E271, doi:10.1532/HSF98.20071152.