Author information:
(1)Division of Epidemiology and Biostatistics, European Institute of Oncology, 
Via Ripamonti 435, Milan 20141, Italy.
(2)Department of Dermatology, University of L'Aquila, 47100 L'Aquila, Italy.
(3)Department of Forensic Molecular Biology, Erasmus MC University Medical 
Center, 3000 DR Rotterdam, The Netherlands.
(4)Department of Dermatology, Erasmus MC University Medical Center, 3000 DR 
Rotterdam, The Netherlands.
(5)1] Department of Dermatology, Brigham and Women's Hospital and Harvard 
Medical School, Boston, MA 02115, USA [2] Channing Laboratory, Department of 
Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 
02115, USA [3] Department of Epidemiology, Harvard School of Public Health, 
Boston, MA 02115, USA.
(6)Division of Molecular Genetic Epidemiology, German Cancer Research Center, 
D-69120 Heidelberg, Germany.
(7)Department of Dermatology, Leiden University Medical Center, 2300 RC Leiden, 
The Netherlands.
(8)Department of Chronic Disease Epidemiology, Yale School of Public Health, 
Yale Cancer Center, New Haven, CT 06520-8034, USA.
(9)Institute of Forensic Research, 31-033 Krakow, Poland.
(10)Murdoch Childrens Research Institute, Royal Children's Hospital, Victoria 
3052, Australia.
(11)Menzies Research Institute Tasmania, University of Tasmania, Hobart, 7001 
Australia.
(12)Department of Pathology, Oslo University Hospital, N-0027 Oslo, Norway.
(13)International Prevention Research Institute, Lyon 69006, France.
(14)Department of Biochemistry, Molecular Biology and Immunology, University of 
Murcia, 30100 Murcia, Spain.
(15)Department of Cancer Epidemiology, Moffitt Cancer Center, Tampa, FL 33612, 
USA.
(16)Division of Cancer Epidemiology and Genetics, National Cancer Institute, 
NIH, Bethesda, MD 20892-7236, USA.
(17)School of Epidemiology, Public Health and Preventive Medicine, University of 
Ottawa, Ottawa, Canada ON K1N 6N5.
(18)Section of Epidemiology and Biostatistics, Institute of Cancer and 
Pathology, University of Leeds, Leeds LS9 7TF, UK.
(19)UCL Institute of Child Health, London WC1N 1EH, UK.