Study	Reason for exclusion
Collado‐Seidel 1997	Results of the congress abstract were published in Collado‐Seidel (1999).
Collado‐Seidel 1999	Double‐blind comparison of sr‐ldopa additionally to rr‐ldopa versus placebo additional to rr‐ldopa.
Kaplan 1993	Diagnosis of PLMS/h > 5 in all patients, RLS‐symptoms were present only in 3 patients.
Polo 2007	Medication period was only two nights.
Polo 2008	Erratum of excluded study Polo 2007.
Reuter 1999	Results of two patients with RLS only analysed descriptively.
Saletu 2003	Medication period was only one night.
Staedt 1998	Open label follow‐up of Staedt 1997.
Stiasny 2001	Preliminary data which were published later in Trenkwalder 2007.
Trenkwalder 2005	Results of the congress abstract were published in Trenkwalder 2007.
von Scheele 1986	Treatment of levodopa and placebo on alternate days.
von Scheele 1990	Two year open label follow‐up.
Wetter 1995	German duplicate of study of Trenkwalder 1995.
Wetter 1995a	Results of the congress abstract were published in Trenkwalder 1995.
Wu Yh 2008	Observational study on levodopa versus acupuncture.