title: Combined B12 and folate deficiency presenting as an aggressive hematologic malignancy.
authors.affiliation: Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Nathan
authors.initials: N
authors.lastname: Singh
authors.affiliation: Department of Pathology, University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Sohail
authors.initials: S
authors.lastname: Qayyum
authors.affiliation: Department of Pathology, University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Mariusz A
authors.initials: MA
authors.lastname: Wasik
authors.affiliation: Division of Hematology and Oncology, University of Pennsylvania, Philadelphia, Pennsylvania.
authors.forename: Selina M
authors.initials: SM
authors.lastname: Luger
mesh_terms: D000328:Adult; D005494:Folic Acid Deficiency / Q000097:blood* / Q000473:pathology*; D019337:Hematologic Neoplasms / Q000097:blood* / Q000473:pathology*; D006801:Humans; D008297:Male; D014806:Vitamin B 12 Deficiency / Q000097:blood* / Q000473:pathology*