PMC:4144696 / 10000-10551 JSONTXT

{"target":"https://pubannotation.org/docs/sourcedb/PMC/sourceid/4144696","sourcedb":"PMC","sourceid":"4144696","source_url":"https://www.ncbi.nlm.nih.gov/pmc/4144696","text":"In each household, the head, or a person who could provide reliable information, was asked to list all the family members within the age range 18–65 years. From this list, one was randomly invited to participate by the sealed envelopes method (this is a method of avoiding bias in selecting participants: the sealed envelope contains the numbers of family members, from which the head of the household picks one randomly). No replacements were permitted within a household for participants who withheld consent or failed to be available for interview.","tracks":[]}