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The Study Group Investigators were: Michele Barbato, M.D., Centro Ambrosiano Metodi Naturali, Milan, Italy, Priscilla Coppieters, M.D., Fédération Francophone pour le Planning Familial Naturel, Couple-Amour-Fécondité, Brussels, Belgium, John France, PhD., DSc., Research Center in Reproductive Medicine, Department of Obstetrics and Gynaecology, University of Auckland School of Medicine, Auckland, New Zealand, Sandro Girotto, M.D., Istituto per l'Educazione alla Sessualità e alla Fertilità (INER - Verona), Verona, Italy, Christian Gnoth, M.D., Natürliche Familien Planung, Frauenklinik, University of Düsseldorf, Germany, Jane Knight, R.N., Fertility UK, London, United Kingdom, Lucia Rovelli, Centro Metodi Naturali di Lugano, Lugano, Switzerland, Cathérine Renard Denis, Centre de Liaison des Equipes de Recherche, Paris, France, and General Coordinators: Bernardo Colombo, Emer. Prof., and Guido Masarotto, Prof., Dipartimento di Scienze Statistiche, Università degli Studi, Padua, Italy.
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