Fig. 1
From: Vitamin D deficiency in critically ill children: a systematic review and meta-analysis
Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) flow diagram of study selection based on inclusion and exclusion criteria. The stages of a systematic selection scheme include identification, screening, eligibility, and final included studies. ICU Intensive care unit, VLBW Very low birth weight, NICU Neonatal intensive care unit, HSCT Hematopoietic stem cell transplant, ALRI Acute lower respiratory infection