[1] Univ Lancaster, Div Hlth Res, HiOne, Sir John Fisher Dr, Lancaster LA1 4YW, England
[2] Univ Leicester, Dept Econ Accounting & Finance, Leicester LE1 7RH, Leics, England
[3] Marche Polytech Univ, Dept Econ & Social Sci, Piazzale Martelli 8, I-60121 Ancona, Italy
[4] Univ Ghent, Dept Econ, Sint Pieterspl 5, B-9000 Ghent, Belgium
[5] IZA Inst Labour Econ, Schaumburg Lippe Str 5-9, D-53113 Bonn, Germany
[6] GLO Global Lab Org, Leimkugelstr 6, D-45141 Essen, Germany
[7] Univ Lancaster, Management Sch, Lancaster LA1 4YX, England