Additional file 1.

The SATS-28 is available from the author: Candace Schau (CS Consultants, LLC, Albuquerque, NM 87111; cschau@comcast.net). The pretest versions of the SATS-28 can be viewed at: http://www.evaluationandstatistics.com. webcite

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Zhang et al. BMC Medical Education 2012 12:117   doi:10.1186/1472-6920-12-117