“…In the only study to examine the effect of change in the presence of SAPROF protective factors over time, an increase in protective factors following inpatient treatment was found to be associated with an absence of violence in the community in a sample of male forensic psychiatric patients (de Vries Robbé, de Vogel, Douglas, & Nijman, 2015). Other studies focusing on adolescent populations and sexual offending (Klein, Rettenberger, Yoon, Köhler, & Briken, 2015;Zeng, Chu, & Lee, 2015) found no consistent relationship between protective factors and violence although they used the adult, rather than the subsequently published adolescent version (de Vries Robbé, Geers, Stapel, Hilterman, & de Vogel, 2015). Perhaps most notably, many studies exploring the validity of the SAPROF have been conducted by the tool's authors, and may therefore be susceptible to authorship bias (Singh, Grann, & Fazel, 2013).…”