Funding for this research was provided by:
Medical Research Council (MC_UU_12013/1, MC_UU_12013/9, MR/P014259/1)
Article History
First Online: 31 December 2018
Compliance with Ethical Standards
:
: PD and GDS are members of the MRC Integrative Epidemiology Unit at the University of Bristol which is supported by the Medical Research Council and the University of Bristol (MC_UU_12013/1, MC_UU_12013/9). PD acknowledges support from a Medical Research Council Skills Development Fellowship (MR/P014259/1).
: PD, GDS and WH declare no conflicts of interest.