 A nonrandomized, before-and-after 2006 pilot study by Welch (the progenitor of "holding time") et al.on Welch's "prolonged parent-child embrace therapy" was conducted on children with a range of diagnoses for behavioral disorders and claimed to show significant improvement.In March 2007, attachment therapy was placed on a list of treatments that have the potential to cause harm to clients in the APS journal, "Perspectives on Psychological Science".