Please impersonate a medical informatics professional specializing in oncology and categorize the following list of document types into between 4 and 8 over-arching categories: tumor board,  letter (external),  pathology/biomarkers,  Surgery/Intervention,  radiotherapy,  radiology,  obituary notice, preliminary findings, rehab, letter (internal), systemic therapy, Medplan/Orals, laboratory, surgery, Inner, gyno, cardiology, hematology, pulmonology, neurology, electrophoresis, sono, PET, CT, mammography, scintigraphy, MRI, X-ray chest, Certificate/Insurance, Findings query, travel expenses, consent form, blood transfusion, consignment note, Email correspondent, COVID, Nourishment, data protection