1. Associate, Sustainable Health Financing, Clinton Health Access Initiative (CHAI) Inc., Bosta, MA, USA; Deutsche Gesellschaft fuer Internationale Zusammenarbeit (GIZ) GmbH, Phnom Penh, Cambodia
2. Associate Professor, Lund University, Lund, Sweden
3. Associate, Strategy and Investment, Health Workforce, Clinton Health Access Initiative (CHAI) Inc., Boston, MA, USA
4. Associate Researcher, Lund University, Lund, Sweden; HEARD, University of Kwazulu-Natal, Durban, South Africa. Correspondence: