[1] City Univ Hong Kong, Coll Business, Dept Management Sci, Kowloon Tong, Hong Kong, Peoples R China
[2] Ecole Polytech Fed Lausann, Risk Analyt & Optimizat Chair, CH-1015 Lausanne, Switzerland
[3] Imperial Coll London, Imperial Coll Business Sch, South Kensington Campus, London SW7 2AZ, England