title: Control your controls and conclusions.
authors.forename: S
authors.initials: S
authors.lastname: Koletzko
authors.forename: N
authors.initials: N
authors.lastname: Konstantopoulos
authors.forename: N
authors.initials: N
authors.lastname: Lehn
authors.forename: D
authors.initials: D
authors.lastname: Forman
mesh_terms: D016022:Case-Control Studies; D004797:Enzyme-Linked Immunosorbent Assay; D005189:False Positive Reactions; D016481:Helicobacter Infections / Q000150:complications* / Q000175:diagnosis; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D007223:Infant; D016133:Polymerase Chain Reaction; D015203:Reproducibility of Results; D012107:Research Design; D013398:Sudden Infant Death / Q000209:etiology*