1. Swedish Institute for Social Research, Stockholm University, 106 91 Stockholm, Sweden
2. Department of Finance, Stockholm School of Economics, 113 83 Stockholm, Sweden
3. Heidelberg Institute of Global Health (HIGH), Interdisciplinary Centre for Scientific Computing (IWR), Heidelberg University, 69117 Heidelberg, Germany
4. Department of Public Health and Clinical Medicine, Umeå University, 901 87 Umeå, Sweden
5. Department of Statistics, Lund University, 221 07 Lund, Sweden