Search strategy for Medline (Ovid)
| 001 | exp infant, low birth weight/ |
| 002 | exp infant, premature/ |
| 003 | (low adj1 birth?weight).ti,ab,sh. |
| 004 | (pre?term adj5 infant$).ti,ab,sh. |
| 005 | (pre?term adj5 bab$).ti,ab,sh. |
| 006 | (premature adj5 infant$).ti,ab,sh. |
| 007 | (premature adj5 bab$).ti,ab,sh. |
| 008 | exp infant mortality/ |
| 009 | death.ti,ab,sh. |
| 010 | surviv$.ti,ab,sh. |
| 011 | exp cohort studies/ |
| 012 | exp gestational age/ |
| 013 | or/1–7 |
| 014 | or/8–10 |
| 015 | 11 or 12 |
| 016 | 13 and 14 and 15 |