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Table 2 Participant timeline with checkpoints and outcome assessment during enrollment, intervention, and follow-up

From: Probiotic supplementation and risk of necrotizing enterocolitis and mortality among extremely preterm infants—the Probiotics in Extreme Prematurity in Scandinavia (PEPS) trial: study protocol for a multicenter, double-blinded, placebo-controlled, and registry-based randomized controlled trial

  1. *Gestational week
  2. **Corrected age