Bentovim 1968 |
Unclear if randomised and dietary treatment not initiated soon after birth in all participants. |
Cleary 2006 |
Trial of a specific supplement. |
Epstein 1989 |
Not a randomised controlled trial. |
Frankenburg 1973 |
Not a randomised controlled trial. |
Kakanoglu 2005 |
Participants not eligible ‐ paper states 'participants previously untreated'. |
Koff 1979 |
Not a randomised controlled trial. |
Koletzko 2007 |
Trial of a fatty acid supplement. |
Krause 1985 |
Not a randomised controlled trial. |
Levy 2007 |
Trial of a specific supplement. |
Lou 1987 |
Trial of an additional supplement. |
Pietz 1995 |
Trial of tyrosine. |
Realmuto 1986 |
Introduced phenylalanine for one day only. |
Rey 1996 |
Not a randomised controlled trial. |
Robertson 2004 |
Participants previously untreated. |
Schindeler 2007 |
Trial of an additional supplement. |
Schmidt 1994 |
Not a randomised controlled trial. |
Schmidt 1996 |
Not a randomised controlled trial. |
Smith 1998 |
Trial of tyrosine. |