. 2018 Aug 21;119(6):724–736. doi: 10.1038/s41416-018-0233-4
© Cancer Research UK 2018
This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International (CC BY 4.0).
Fig. 1.
Flow chart illustrating studies selected