1. Department of Pharmacology, University of Oxford, UK (M.L., D.A.T.).
2. Key Laboratory of Medical Electrophysiology of the Ministry of Education and Institute of Cardiovascular Research, Southwest Medical University, Luzhou, China (M.L., L.W.).
3. Department of Cardiology, Peking University First Hospital, China (L.W.).
4. Physiological Laboratory and Department of Biochemistry, University of Cambridge, UK (C.L.-H.H.).