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Facial Appearance Is a Cue to Oestrogen Levels in WomenM. J. Law Smith, D. I. Perrett, B. C. Jones, R. E. Cornwell, F. R. Moore, D. R. Feinberg, L. G. Boothroyd, S. J. Durrani, M. R. Stirrat, S. Whiten, R. M. Pitman and S. G. Hillier · Proceedings: Biological Sciences · 2006