| BPD | Bronchopulmonary dysplasia |
| CA | Corrected age |
| FEV1 | Forced expiratory volume 1 s |
| GA | Gestational age |
| HM | Human milk |
| LRTI | Lower respiratory tract infection |
| MM | Maternal milk |
| NEC | Necrotizing enterocolitis |
| RTI | Respiratory tract infection |
| RCT | Randomized controlled trial |
| RSV | Rhino syncytial virus |
| VAP | Ventilatory acquired pneumonia |
| VLBW | Very low birth weight |
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