1 Fondazione CNR-Regione Toscana G. Monasterio, Institute of Clinical Physiology, National Research Institute, Pisa, Italy.
2 Advanced Biomedical Sciences, Adult and Pediatric Cardiac Surgery, University of Naples Federico II, Via Pansini, 5, 80131 Naples, Italy. Electronic address: r.giordano81@libero.it.
3 Helen B. Taussig Heart Center, Johns Hopkins Hospital and School of Medicine, Baltimore, Maryland.