1. School of Mathematics and Statistics; University of Glasgow; Glasgow UK
2. School of Civil Engineering; Xinjiang University; Xinjiang China
3. Institute of Cardiovascular and Medical Sciences; University of Glasgow; Glasgow UK
4. Leon H. Charney Division of Cardiology; Department of Medicine, New York University School of Medicine; New York, New York USA
5. Department of Mathematics; Courant Institute of Mathematical Sciences, New York University; New York, New York USA