The effects of breath-holding on pulmonary regurgitation measured by cardiovascular magnetic resonance velocity mapping
Bengt Johansson, Sonya V Babu-Narayan, and Philip J Kilner
J Cardiovasc Magn Reson. 2009; 11(1): 1. Published online 2009 January 14. doi: 10.1186/1532-429X-11-1.PMCID: PMC2629465