1. Pathology and Tumour Biology, Leeds Institute of Molecular Medicine, University of Leeds, Leeds, United Kingdom
2. Pathology Department, Institute for Cancer Research and Treatment, Turin, Italy
3. Screening Group, Early Detection and Prevention Section, International Agency for Research on Cancer, Lyon, France
4. Quality Assurance Group, Early Detection and Prevention Section, International Agency for Research on Cancer, Lyon, France
5. Institute of Pathology, Klinikum Bayreuth, Bayreuth, Germany