“…Those who declined to participate may have been experiencing more psychological difficulties, thereby affecting our results. Finally, before 2004, some Dutch clinics provided a "donor passport" containing information about the donor's personality traits, talents, and interests (Winter et al, 2012), which may have satisfied the curiosity of their offspring (Ravelingien, Provoost, & Pennings, 2015). Adolescents in this study were not asked whether they had such a passport, thus precluding comparisons based on information received from the sperm bank.…”