Study	Reason for exclusion
de‐Zoysa 1994	No control group
El Bayoumi 2011	Plasma exchange was compared to intravenous immunoglobulin in children being ventilated for severe GBS
Mendell 1985	The study evaluated the effects of the combination of plasma exchange and corticosteroids versus supportive care and not of plasma exchange alone versus supportive care
Morosetti 1994	Plasma exchange was compared to plasma perfusion and not to conservative treatment alone
Rock 1997	The study population was made up of participants with GBS and participants with myasthenia gravis. Separate data for participants with GBS could not be obtained
Wollinsky 2001	Plasma exchange was compared to cerebrospinal fluid filtration and not to conservative treatment alone

GBS: Guillain‐Barré syndrome.