CSEC 1 adolescent 1 article 1 child 1 child sexual exploitation child welfare 1 commercial sexual exploitation of children 1 controlled study 1 female 1 human 1 human tissue 1 juvenile 1 major clinical study 1 male 1 maltreatment 1 prevalence 1 reliability 1 risk assessment 1 school child 1 screening instrument 1 sexuality 1 theoretical study 1 validity 1 wellbeing 1