To determine operational and analytical characteristics of respondent-driven sampling (RDS) in international settings and to explore factors that may affect recruitment of most-at-risk populations… (More)
Amplification of DNA by the polymerase chain reaction (PCR) offers a highly sensitive and specific method for detecting DNA sequences in biological samples. We applied this technology to develop an… (More)
The efficacy of contrast-enhanced magnetic resonance imaging (MRI) for detecting and characterizing, or excluding, hepatic masses was assessed in 404 patients, following the intravenous… (More)
Pneumocystis carinii pneumonia is a leading cause of morbidity and mortality in patients with the acquired immunodeficiency syndrome (AIDS). Much remains unknown about the basic biology of P. carinii… (More)
Percutaneous abscess drainage using cross-sectional imaging has become an accepted and important clinical tool. Most previous reports have emphasized the importance of CT as the primary study for… (More)