Table 1 Search strategy

Cochrane Central Register of Controlled Trials (CENTRAL)

#1 MeSH descriptor: [Psoriasis] explode all trees

#2 Psoriasis:ti,ab,kw (Word variations have been searched)

#3 #1 or #2

#4 MeSH descriptor: [Fish Oils] explode all trees

#5 Fish Oil:ti,ab,kw (Word variations have been searched)

#6 fish liver oil:ti,ab,kw (Word variations have been searched)

#7 MeSH descriptor: [Cod Liver Oil] explode all trees

#8 Cod Liver Oil:ti,ab,kw (Word variations have been searched)

#9 MeSH descriptor: [Fatty Acids, Omega-3] explode all trees

#10 Omega-3:ti,ab,kw (Word variations have been searched)

#11 Omega3:ti,ab,kw (Word variations have been searched)

#12 MeSH descriptor: [Eicosapentaenoic Acid] explode all trees

#13 EPA:ti,ab,kw (Word variations have been searched)

#14 eicosapentaenoic acid:ti,ab,kw (Word variations have been searched)

#15 eicosapentaenoate:ti,ab,kw (Word variations have been searched)

#16 icosapentaenoic acid:ti,ab,kw (Word variations have been searched)

#17 MeSH descriptor: [Docosahexaenoic Acids] explode all trees

#18 DHA:ti,ab,kw (Word variations have been searched)

#19 docosahexaenoic acid:ti,ab,kw (Word variations have been searched)

#20 docosahexaenoate:ti,ab,kw (Word variations have been searched)

#21 #4 or #5 or #6 or #7 or #8 or #9 or #10 or #11 or #12 or #13 or #14 or #15 or #16 or #17 or #18 or #19 or #20

#22 #3 and #21

Embase

#1 ‘psoriasis’/exp. OR ‘psoriasis’

#2 ‘fish oil’

#3 ‘fish liver oils’

#4 ‘cod liver oil’

#5 ‘omega 3 fatty acid’

#6 ‘eicosapentaenoic acid’

#7 ‘icosapentaenoic acid’

#8 eicosapentaenoate

#9 ‘docosahexaenoic acid’

#10 docosahexaenoate

#11 #2 OR #3 OR #4 OR #5 OR #6 OR #7 OR #8 OR #9 OR #10

#12 #1 AND #11

MEDLINE

1 exp Psoriasis/

2 psoriasis.mp.

3 1 or 2

4 exp. Fish Oils/

5 fish oil.mp.

6 fish liver oil.mp.

7 exp. Cod Liver Oil/

8 cod liver oil.mp.

9 exp. Fatty Acids, Omega-3/

10 omega-3.mp.

11 omega3.mp.

12 exp. Eicosapentaenoic Acid/

13 EPA.mp.

14 eicosapentaenoic acid.mp.

15 eicosapentaenoate.mp.

16 icosapentaenoic acid.mp.

17 exp. Docosahexaenoic Acids/

18 DHA.mp.

19 docosahexaenoic acid.mp.

20 docosahexaenoate.mp.

21 or/4–20

22 3 and 21