Guideline for the investigation and management of eosinophilia.

Royal Liverpool and Broadgreen University Teaching Hospitals NHS Trust, Liverpool, University College London Hospitals NHS Foundation Trust, London Hull and East Yorkshire Hospitals NHS Trust, Wellcome Trust Sanger Institute, Cambridge, Faculty of Medicine, University of Southampton, Southampton, Department of Haematology, University Hospital Southampton, Southampton, Heart of England NHS Foundation Trust, Birmingham, Guy’s and St Thomas’ NHS Foundation Trust, London, Division of Cancer & Genetics, School of Medicine, Cardiff University, Cardiff., King's College Hospital NHS Foundation Trust, London, MRC Molecular Haematology Unit, Weatherall Institute of Molecular Medicine, University of Oxford and BRC Blood Theme, NIHR Oxford Biomedical Centre, Oxford, UK and Imperial College London, St Mary’s Hospital, London, UK