Nuscript; RP: analysis and interpretation of data, critical review of the manuscript; SB: critical review of the manuscript; AFF: acquisition of data; RC: acquisition and interpretation of CT images; SB: acquisition and interpretation of CT images; MC: have given final approval ofFaustino et al. BMC Cardiovascular Disorders 2014, 14:2 http://www.biomedcentral.com/1471-2261/14/Page 10 of13.14.15. 1