CPO and attention deficit-hyperactivity disorder: Albeit there has been an open debate on whether CPF/CPO exposure is or not associated with ASD and ADHD (De Cock et al. 2012; Shelton et al. 2012; Williams and DeSesso 2014), more recent animal and human studies show positive correlations between these factors (Von Ehrenstein et al. 2019; De Felice et al. 2015; Gunier et al. 2017; Lan et al. 2017; Roberts et al. 2019; Shelton et al. 2014).