Baylor College of Medicine, Houston, TX, USA
J. L. Simpson
Johns Hopkins University, Baltimore, MD, USA
R. Gray & R. Kambic
Georgetown University, Washington DC, USA
J. Queenan & V. Jennings
Pontifica Catolica de Chile, Santiago, Chile
A. Perez
University of Chile, Santiago, Chile
P. Mena
C.A.M.E.N., Milan, Italy
M. Barbato
Javeriana, Bogota, Colombia
F. Pardo
ATLF, Lima, Peru
B. Tagliabue
Maryland/DC Providers, Washington DC, USA
W. Stevenson
NFP Study Group, University of Düsseldorf, Düsseldorf, Germany
C. Gnoth, P. Frank-Hermann, G. Freundl, J. Kunert & E. Godehardt
Fédération francophone pour le P.F.N., Belgium
A. de Leizaola-Cordonnier
Quidel Corporation, San Diego, CA, USA
H. M. S. Murthy, L. Taggesell, J. Burd & A. Pronovost
Women's Medical Center, University of Southern California, Los Angeles, CA, USA
F. Stanczyk
Quidel Corporation, San Diego, CA, USA
M. D. Fiechtner & A. D. Pronovost