1. Pharmacology and Physiology Department, School of Medicine and Health Sciences, The George Washington University, Washington, District of Columbia.
2. L.A.Orbeli Institute of Physiology, National Academy of Sciences, Yerevan, Armenia.
3. Department of Biomedical Engineering, University of California Davis, Davis, California.
4. Institute for Stem Cell and Regenerative Medicine, Center for Cardiovascular Biology, University of Washington, Seattle, Washington.