Study	Reason for exclusion
Clarke 1997	Not an RCT.
Cukiert 2013	Ineligible population (patients with Lennox‐Gastaut Syndrome).
DeGiorgio 2000	Not an RCT.
Garcia‐Navarrete 2013	Not an RCT.
George 1994	Not an RCT.
Hornig 1997	Not an RCT.
Marras 2013	Not an RCT.
Marrosu 2003	Not an RCT.
Marrosu 2005	Not an RCT.
Morris 1999	Not randomised controlled trial.
Muller 2010	Ineligible population (patients with Lennox‐Gastaut Syndrome).
NCT00215215 2005	This study has been terminated and no data was available.
NCT01118455 2004	This study has been terminated and no data was available (insufficient enrolment).
NCT01178437 2009	This study has been terminated and no data was available.
Ronkainem 2006	Not an RCT.
Rossignol 2009	Not an RCT.
Salinsky 1996	Not an RCT.
Scherrrmann 2001	Not an RCT.
Shimizu 1995	Not an RCT.
Sirven 2000	Not an RCT.
Uthman 1993	Not an RCT.
Wang 2004	Not an RCT.
Wang 2009	Not an RCT.