[1] Univ Adelaide, Business Sch, Adelaide, SA 5005, Australia
[2] Maastricht Univ, Sch Business & Econ, Tongersestr 53, NL-6211 LM Maastricht, Netherlands
[3] Open Univ, Fac Management, Valkenburgerweg 177, NL-6419 AT Heerlen, Netherlands
[4] Univ Stellenbosch, Business Sch, Carl Cronje Dr, ZA-7530 Cape Town, South Africa