Study	Reason for exclusion
Agrawal 1999	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Gries 2000	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Harris 1987	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Horowitz 1994	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Klig 1997	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Qureshi 2001	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Scarfone 1993	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Scarfone 1995	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.
Webb 1986	Treatment with OCS was only commenced after the participants had been reviewed by a doctor.