Please answer the following question: Pediatric Hematology and Oncology is an international peer-reviewed medical journal that covers all aspects of pediatric hematology and oncology. The journal covers immunology pathology and pharmacology in relation to blood diseases and cancer in children and shows how basic experimental research can contribute to the understanding of clinical problems. Given a list of categories: company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, what category does the paragraph belong to?
A:
Written Work