Hanefeld Johanna, Vearey Jo, Lunt Neil
London School of Hygiene & Tropical Medicine, London WC1H 9SH, UK.
Africa Centre for Migration and Society, School of Social Sciences, University of the Witwatersrand, Johannesburg, South Africa.
Lancet. 2017 Jun 17;389(10087):2358-2359. doi: 10.1016/S0140-6736(17)31588-X. Epub 2017 Jun 15.