- Correspondence to Dr Eva U B Kibele, Population Research Centre, Faculty of Spatial Sciences, University of Groningen, PO Box 800, 9700 AV Groningen, The Netherlands;
- Received 19 July 2012
- Revised 23 January 2013
- Accepted 4 February 2013
- Published in print 1 May 2013.
- Published online 21 March 2013.
- Published first 8 March 2013.
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