“…Telephone or Internet-based studies, which are cheaper, can be implemented from a distance and may also reach displaced persons (via cell phone); these may be better options if phone and Internet services are functioning. However, persons without Internet or phone services will be excluded and estimates may not represent the target population (22). Certain populations, such as children, minority groups, nonnative speakers, homeless persons, transient youth, and migrant populations, may be particularly difficult to reach after a disaster (22,67).…”