Longitudinal Studies
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches
Case Studies
Study Design in Statistics
Longitudinal Research
Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture
You might also read
Articles linked to this work by shared authors, journal, and citation graph.
Updated: Jul 4, 2026

Observational Study Protocol for Repeated Clinical Examination and Critical Care Ultrasonography Within the Simple Intensive Care Studies
Published on: January 16, 2019
1Department of Epidemiology, School of Public Health University of North Carolina, Chapel Hill, NC 27599-7435, USA. andy_olshan@unc.edu
Residential radon exposure may be linked to childhood leukemia, but more research is needed. A systematic approach and new strategies for replication studies are crucial for reliable findings on radon and child cancer risk.
Area of Science:
Background:
Discussion:
Key Insights:
Outlook: