. 2016 Aug 27;388(10047):871–880. doi: 10.1016/S0140-6736(16)31140-0
© 2016 The Author(s). Published by Elsevier Ltd. This is an Open Access article under the CC BY license
This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).