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This study was a secondary analysis of clinical trial data.
The study design was a secondary analysis of a prospective observational study.
This was a secondary analysis of a prospective cohort of cancer patients admitted to three ICUs with healthcare-associated pneumonia.
This was a secondary analysis of previous epidemiological survey data of primary headache disorders in mainland of China [4].
This was a secondary analysis of the Pediatric Health Information System (PHIS), an administrative database from pediatric hospitals.
One strength of this study is the prospective collection of data, although it was a secondary analysis of a database that was not designed to this specific aim.
This was a secondary analysis of a prospective cohort of cancer patients admitted to three ICUs with the diagnosis of HCAP.
This was a secondary analysis of data from our previously reported nationwide epidemiological survey of primary headache disorders in the mainland of China [7].
Design: This study was a secondary analysis of a nonprobability convenience sampling of 67 patients, ages 18 to 80 years, who were admitted to an inpatient psychiatric unit.
This was a secondary analysis of data collected from a study examining the pathophysiology of Bipolar Disorder.
This study was a secondary analysis.
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