“In 2001, Patrick Cristopher Rolland was a candidate for the Master of Technology in Chiropractic Degree from Technikon Witwaterstrand, South Africa. His master's thesis was The Effect of Chiropractic Manipulative Therapy on Children With Attention Deficit Hyperactivity Disorder. …Despite [its] shortcomings, does this study validate the notion that spinal manipulation or chiropractic care can be a useful adjunct to the management of ADHD in children? No. The parents' responses were positive — but the parents knew that the study subjects were enrolled in the study. Bias is unavoidable. The teachers' responses (who presumably did not know the childrens' participation) were unchanged. Liz Ditz blogspot (20th December 2009)