Children's school programs regarding "good touch … bad touch" can provide children with a forum in which to role-play and learn to avoid potentially harmful scenarios. Pediatricians can help identify children at risk of maltreatment and intervene with the aid of a social worker or provide access to treatment that addresses potential risk factors such as maternal depression. Videoconferencing has also been used to diagnose child abuse in remote emergency departments and clinics. Unintended conception increases the risk of subsequent child abuse, and large family size increases the risk of child neglect. Thus, a comprehensive study for the National Academy of Sciences concluded that affordable contraceptive services should form the basis for child abuse prevention. "The starting point for effective child abuse programming is pregnancy planning," according to an analysis for US Surgeon General C. Everett Koop.