 We did research on cardiac patients at the University of California, San Diego, and some of our research was in collaboration with scientists and clinicians in Scotland and Tehran and also in Spain, so it's been very interdisciplinary and inter-institutional research. But the cardiac patients, you might remember, in addition to evaluating when they practice gratitude, how they were doing in terms of stress, how they were doing in terms of sleep, anxiety. We also did measure cardiac physiology and we also drew blood. And essentially after two months of practicing gratitude, keeping that journal, these patients had about a 22% reduction in inflammatory biomarkers in their peripheral bloodstream, which was really quite remarkable.