For example, in such settings, recruitment efforts, if they involve door-to-door sampling or walk-ins to an easily identifiable research recruitment location, can alert community members to the nature of a child's actual or suspected disorder.
Confidential self-report questionnaires using internationally utilised measures were completed by children aged 10-17 (n = 3515, 56.7% female) using door-to-door sampling in randomly selected areas in rural and urban locations of South Africa.
Many studies collecting pet population data use cross sectional study designs and administer questionnaires to a sample from a given population within the specified study regions by telephone [ 5, 27- 29], postal addresses [ 30], door-to-door sampling [ 4, 5, 19] or census-type selection methods [ 6, 31].
Brenda Eskenazi, director of the Center for Environmental Research and Children's Health at the University of California, Berkeley, points out that hospital or clinic-based recruitment improves on door-to-door sampling "because you're working with women who are already in the medical system".
In 1952, while at Baltimore City Hospitals, he started going door to door collecting stool samples of children living in the slums of East Baltimore to evaluate their exposure to lead.
Going door to door to collect blood samples, volunteer health workers or 'kaders' continue to play an important role in ensuring Sabang, with its 30,000 inhabitants, remain malaria free.
Every household in the block groups was sampled door to door on weekends 2006 2008, with one adult participant permitted per household.
Since the cases were identified, health workers have been going door to door in the neighborhood collecting urine samples for testing of residents.
The study population was sampled by door to door survey, during the regular surveillance rounds.
Subjects aged 40 years and above was selected using a cluster sampling methodology and a door to door enumeration was conducted for a population based cross sectional study.
Community-based sampling obtained a random, household-probability sample of African-American adults from California, surveyed door to door in randomly selected census tracts statewide.
