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Bhatt, Ami B; Defaria Yeh, Doreen . (2015). Long-term outcomes in coarctation of the aorta: an evolving story of success and new challenges: Figure 1. Heart, 101(15), 1173–1175. doi:10.1136/heartjnl-2015-307641 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research