[1] Univ Zurich, Dept Banking & Finance, Zurich, Switzerland
[2] Bogazici Univ, Ctr Appl Res Finance, Istanbul, Turkey
[3] ETH, Dept Math, Zurich, Switzerland
[4] Dublin City Univ, DCU Business Sch, Dublin 9, Ireland
[5] Univ Waikato, Sch Accounting Finance & Econ, Hamilton, New Zealand
[6] Bilkent Univ, Fac Business Adm, TR-06800 Ankara, Turkey
[7] Univ Southampton, Southampton Business Sch, Southampton SO17 1BJ, Hants, England