S.H.E. and N.P.S. led the drafting of the text. S.H.E., N.P.S., B.G., D.L., E.R.C., L.F.-C., B.H., M.D.M., M.P., J.J.P., H.-O.P., D.C.R., A.C.R., R.S.-R., E.L.F.S., W.S., L.C.S. and E.T. conceptualized the paper and provided editorial input. S.H.E., N.P.S., B.G., E.R.C., L.F.-C., B.H., M.P., A.C.R., W.S., L.C.S. and E.T. wrote sections of the paper and provided editorial input throughout. A.B., F.D., B.G., D.L. and S.H.E. developed graphics and contributed to conceptualization.