1. University of Neuchâtel , Institut de Statistique , Pierre à Mazel 7, 2000 Neuchâtel , Switzerland
2. Statistics Belgium , Koning Albert II laan 16 , Brussels , Belgium .
3. Statistics Finland . Työpajankatu 13, 00580 Helsinki , Finland .
4. Statistics Sweden , Klostergatan 23, SE-701 89,Örebro , Sweden .
5. Statistics Sweden , Solna strandväg 86, SE-171 54 , Solna , Sweden .
6. Australian Bureau of Statistics, Methodology Division , Locked bag 10, 2617 , Belconnen , Australia .
7. University of Michigan , Institute for Social Research , 4620 North Park Avenue Apt 1406W Chevy Chase, Maryland, 20815, U.S.A.