Study	Reason for exclusion
Blijlevens 2005	Study in adults
Cohen 2010	Not a randomised or quasi‐randomised controlled study
Coquin 1981	Study in adults
Dacou 1983	Not a nutritional intervention
Fang 2007	Study in adults
Filler 1976	Not a randomised or quasi‐randomised controlled study
Forchielli 1997	Not a randomised or quasi‐randomised controlled study
Gassas 2006	Not a randomised or quasi‐randomised controlled study
Okur 2006	Not a randomised or quasi‐randomised controlled study
Piccirillo 2003	Study in adults
Rickard 1979	Not a randomised or quasi‐randomised controlled study
Rickard 1980	Not a randomised or quasi‐randomised controlled study
Scheid 2004	Study in adults
Scheltinga 1991	Study in adults
Shamberger 1983	Not exclusively children ‐ data for children not reported separately
Shamberger 1984	Duplicate publication of Shamberger 1983
Sornsuvit 2008	Not exclusively children ‐ data for children not reported separately
Sykorova 2005	Study in adults, not chemotherapy
Van Eys 1982a	Not a randomised or quasi‐randomised controlled study
Wada 2010	Inappropriate intervention (probiotic)
Ward 2003	Not a randomised or quasi‐randomised controlled study
Yildirim 2013	Not a randomised or quasi‐randomised controlled study