Use of antimicrobials in childhood by AYA HL patients relative to comparators. Age-specific HRs (lines) with 95% confidence intervals (shaded areas) for use of antimicrobials by patients with classical HL of any type (A) and by NSHL (B) and MCHL (C) patients relative to comparators. Inspection of graphs of antimicrobial use for cases and comparators revealed that our results were not driven by only few individuals (data not shown).