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The APW-RSV II trial design
V: Visit, *Variable durations of follow-up periods are necessary, as patients were recruited over 3 consecutive RSV seasons. Therefore, not all patients will perform V4 and V5. **V3–V5 are conducted yearly. APW-RSV: The Azithromycin to Prevent Wheezing following severe RSV bronchiolitis, FU: Follow up.
