Feedback from Outcome Measures and Treatment Effectiveness, Treatment Efficiency, and Collaborative Practice: A Systematic Review.

"Other Sources of Bias Finally, 18 (56 %) studies reported other potential sources of bias, where the most common reason (n = 14, 44 %) was a small sample size (Ashaye et al. 2003; Copeland 2007; Galvinhill 2001; Lester, 2012; Murphy et al. 2012; Probst et al. 2013; Reese et al. 2009a, b; Rise et al. 2012; Schmidt et al. 2006; Simon et al. 2013; Soeken et al. 1981; Trudeau 2000; Truitt 2011)."

"This is an independent report commissioned and funded by the Policy Research Programme in the Department of Health. The views expressed are not necessarily those of the Department. The Child Policy Research Unit (CPRU) is funded by the Department of Health Policy Research Programme. The authors thank the members of CPRU: Terence Stephenson, Catherine Law, Amanda Edwards, Ruth Gilbert, Steve Morris, Helen Roberts, Cathy Street and Russell Viner."