Study	Reason for exclusion
Alicandro 2013	Omega 3 supplementation compared with large omega‐6 fatty acid source (germ oil) rather than a neutral placebo that contains relatively little omega‐3 or omega‐6 fatty acid (olive oil).
Christophe 1992	Omega‐3 supplementation compared with large omega‐6 fatty acid source (borache oil) rather than a neutral placebo that contains relatively little omega‐3 or omega‐6 fatty acid (olive oil).
Katz 1996	Parenteral (via blood stream), not enteral (oral) supplementation with omega‐3 fatty acids.
Koletzko 2000	Eligibility unclear, attempts made to contact author for further information, but no response received.
Kurlandsky 1994	Omega‐3 supplementation compared with large omega‐6 fatty acid source (sunflower oil) rather than a neutral placebo that contains relatively little omega‐3 or omega‐6 fatty acid (olive oil).
Lloyd‐Still 2006	Omega‐3 supplementation compared with large omega‐6 fatty acid source (corn/soy) rather than a neutral placebo that contains relatively little omega‐3 or omega‐6 fatty acid (olive oil).
Romano 1997	Eligibility unclear, attempts made to contact author for further information, but no response received.
Starling 1988	Eligibility unclear, attempts made to contact author for further information, but no response received.
van Biervliet 2008	Omega‐3 supplementation compared with large omega‐6 fatty acid source (sunflower oil) rather than a neutral placebo that contains relatively little omega‐3 or omega‐6 fatty acid (olive oil).