“…Six articles were excluded because they were not directly related to cranial orthoses therapy in deformational plagiocephaly (n = 5), or involved nonhuman subjects (n = 1). Of the remaining 36 papers, 21 were primary research literature articles, 5,6,[9][10][11][12][13][14][15][16][17]20,25,26,31,33,[35][36][37]39,41 12 were reviews, 7,8,[22][23][24]29,30,32,34,38,40,42 2 were letters, 3,18 and 1 described the methodology of an ongoing randomized controlled trial. 43 Of the 21 primary research articles, there were 7 Class II studies, 10,11,13,17,25,31,36 1 Class III study, 33 and 13 Class IV studies.…”