Fig. 1From: Continuous positive airway pressure (CPAP) vs noninvasive positive pressure ventilation (NIPPV) vs noninvasive high frequency oscillation ventilation (NHFOV) as post-extubation support in preterm neonates: protocol for an assessor-blinded, multicenter, randomized controlled trialNeonatal Intensive Care Units participating to the trial. Different colors represent the number of NICU participating in each areaBack to article page