1     exp prematurity/
2     exp low birth weight/ 
3     exp small for date infant/ 
4     exp very low birth weight/ 
5     (prematur* adj2 infant*).tw. 
6     (prematur* adj2 newborn*).tw. 
7     (prematur* adj2 neonate*).tw. 
8     preterm.tw. 
9     low birth weight.tw. 
10     low birthweight.tw. 
11     VLBW.tw. 
12     LBW.tw. 
13     ELBW.tw. 
14     small for gestation*.tw. 
15     SGA.tw. 
16     (less than adj6 g).tw. 
17     (less than adj3 32 weeks).tw. 
18     birth weight below.tw. 
19     (gestation* adj2 less than).tw. 
20     or/1-19 
21     exp breast feeding/ 
22     exp infant nutrition/ 
23     exp protein intake/ 
24     exp dietary supplement/ 
25     exp omega 3 fatty acid/ct, ad, dt, ig, pa [Clinical Trial, Drug Administration, Drug Therapy, Intragastric Drug Administration, Parenteral Drug Administration] 
26     exp arachidonic acid/ae, ct, ad, dt, ig, pa, th [Adverse Drug Reaction, Clinical Trial, Drug Administration, Drug Therapy, Intragastric Drug Administration, Parenteral Drug Administration, Therapy] 
27     exp unsaturated fatty acid/ct, dt, pa, th [Clinical Trial, Drug Therapy, Parenteral Drug Administration, Therapy] 
28     exp fat intake/ae, ad, dt [Adverse Drug Reaction, Drug Administration, Drug Therapy] 
29     exp enteric feeding/ 
30     exp parenteral nutrition/ 
31     exp artificial milk/ 
32     exp breast milk/ 
33     exp fortified food/ 
34     exp elemental diet/ 
35     exp baby food/ 
36     (breast milk or human milk).tw. 
37     formula.tw. 
38     PUFA supplement*.tw. 
39     feed* regimen*.tw. 
40     (protein* adj2 concentration*).tw. 
41     probiotic$.tw. 
42     parenteral*.tw. 
43     enteral*.tw. 
44     maternal milk.tw. 
45     multinutrient supplement*.tw. 
46     (breast fed or breastfed).tw. 
47     prebiotic*.tw. 
48     diet* supplement*.tw. 
49     nutrient enriched.tw. 
50     Docosahexaenoic Acid*.tw. 
51     arachidonic acid*.tw. 
52     (glutamine adj2 supplement*).tw. 
53     (taurine adj2 supplement*).tw. 
54     (calcium adj2 supplement*).tw. 
55     palm olein.tw. 
56     palmitic acid.tw. 
57     (fortification or fortified).tw. 
58     fatty acids.tw. 
59     supplement* feed*.tw. 
60     complementary feed*.tw. 
61     nutrition*.tw. 
62     Hydrolysed liquid.tw. 
63     Hydrolyzed liquid.tw.
64     gamma-linoleic acid.tw. 
65     (diet* adj3 protein*).tw. 
66     or/21-65 
67     20 and 66 
68     Clinical Trial/ 
69     Randomized Controlled Trial/ 
70     exp randomization/ 
71     Single Blind Procedure/ 
72     Double Blind Procedure/
73     Crossover Procedure/ 
74     Placebo/ 
75     Randomi?ed controlled trial$.tw. 
76     Rct.tw. 
77     random allocation.tw. 
78     randomly.tw. 
79     randomly allocated.tw. 
80     allocated randomly.tw. 
81     (allocated adj2 random).tw. 
82     Single blind$.tw. 
83     Double blind$.tw. 
84     ((treble or triple) adj blind$).tw. 
85     placebo$.tw. 
86     prospective study/ 
87     or/68-86 
88     case study/ 
89     case report.tw. 
90     abstract report/ or letter/ 
91     or/88-90 
92     87 not 91 
93     67 and 92