Lawrence H. Summers Author contributions: L.S. conceptualized the study with input from D.J. V.F. carried out the analyses. V.F. and D.J. wrote the first draft and all authors contributed to revision and writing of the final draft.
Lawrence H. Summers Author contributions: L.S. conceptualized the study with input from D.J. V.F. carried out the analyses. V.F. and D.J. wrote the first draft and all authors contributed to revision and writing of the final draft.