Fig. 1From: Asthma increases the risk of herpes zoster: a nested case–control study using a national sample cohortA schematic illustration of the participant selection process that was used in the present study. Out of a total of 1,125,691 participants, 59,945 of asthma participants were matched with 239,780 control participants for age, group, sex, income group, region of residence, and the past medical historyBack to article page