1. From University of Michigan, Ann Arbor, Michigan; Fred Hutchinson Cancer Research Center, Seattle, Washington; Erasmus Medical Center, Rotterdam, the Netherlands; National Cancer Institute, Bethesda, Maryland; Queen Mary University of London, London, United Kingdom; Sahlgrenska University Hospital, Göteborg, Sweden; Johns Hopkins Medicine, Baltimore, Maryland; University of Tampere, Tampere, Finland; Washington University School of Medicine, St. Louis, Missouri;
2. University of Colorado, Denver, Colorado; Provinciaal Instituut voor Hygiëne, Antwerp, Belgium; Kantonsspital Aarau, Aarau, Switzerland; Institute for Cancer Prevention, Florence, Italy; Universidad Complutense de Madrid, Parla, Madrid, Spain; and Université de Lille, Lille, France.