Question: 1.Study excerpt: This study was a part of a multi-site prospective observational study of COPD [chronic obstructive pulmonary disease] patients to explore the relationship between

1.Study excerpt: "This study was a part of a multi-site prospective observational study of COPD [chronic obstructive pulmonary disease] patients to explore the relationship between depression, inflammation, and functional status...Participants were recruited from various sources including outpatient clinics from three medical centers, pulmonary rehabilitation programs, a research database maintained by the investigators, queries of medical records and pulmonary function tests, Better Breathers Club, community pulmonary practices, advertisements, study website, and other referrals." A total of 282 patients with COPD were included in the study.

(1) the sampling method presented is either aprobability ornonprobability sampling method;

(2) identify thespecific sampling methodusedthat is,

nonprobability samples

convenience

quota

purposive

network

theoretical sampling

probability samples

simple random

stratified random

cluster

systematic sampling

(3) provide arationale for the sampling methodyou selected. Some of the examples might includemore than one sampling methodto obtain the study sample.

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