1. From Bioengineering and Chronobiology Laboratories, University of Vigo, Campus Universitario, Vigo, Spain (R.C.H., D.E.A., A.M., J.R.F., I.A.), and the Department of Obstetrics and Gynecology, Hospital General Clínico Universitario de Galicia, Medical School, University of Santiago, Santiago de Compostela, Spain (I.S., R.U., M.I.).