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.).