1 Department of Cardiothoracic Surgery, Leiden University Medical Center, Leiden, The Netherlands; Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands.
2 Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands; Department of Cardiology, Leiden University Medical Center, Leiden, The Netherlands.
3 Department of Anatomy and Embryology, Leiden University Medical Center, Leiden, The Netherlands.