title: Each condition should be carefully studied, ideally with homogenous patient groups. Preface.
authors.affiliation: Division of Immunology and Allergy, Department of Pediatrics, The University of Toronto, The Hospital for Sick Children, 555 University Avenue, Toronto, ON M5G 1X8, Canada. croifman@sickkids.ca
authors.forename: Chaim M
authors.initials: CM
authors.lastname: Roifman
mesh_terms: D000818:Animals; D003937:Diagnosis, Differential; D018380:Hematopoietic Stem Cell Transplantation; D006801:Humans; D007153:Immunologic Deficiency Syndromes / Q000175:diagnosis* / Q000235:genetics / Q000276:immunology / Q000628:therapy*; D017410:Practice Guidelines as Topic; D014181:Transplantation Immunology