24 IZA Discussion Papers
IZA Discussion Paper No. 9832
IZA Discussion Paper No. 9712
IZA Discussion Paper No. 6124
published in: Health Economics, 2015, 24 (2), 206 - 223
IZA Discussion Paper No. 5779
published in: Journal of Human Resources, 2014, 49 (4), 872-905
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