References
- Dent C., Galaif J., Sussman S., Burtun D., Flay B. Demographic, psychosocial, and behavioral differences in samples of actively and passively consented adolescents. Addict. Behav. 1993; 28: 51–56
- Ellickson P., Hawes J. An assessment of active versus passive methods for obtaining parental consent. Eval. Rev. 1989; 13: 45–55
- Kearney K., Hopkins R., Mauss A., Weisheit R. Sample bias resulting from a requirement for written parental consent. Public Opin. Q. 1983; 47: 96–102
- Moberg D., Piper D. Obtaining active parental consent via telephone in adolescent substance abuse prevention research. Eval. Rev. 1990; 14: 315–323