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Descriptive studies: what they can and cannot do.
Grimes DA, Schulz KF. Grimes DA, et al. Among authors: schulz kf. Lancet. 2002 Jan 12;359(9301):145-9. doi: 10.1016/S0140-6736(02)07373-7. Lancet. 2002. PMID: 11809274 Review.
Cohort studies: marching towards outcomes.
Grimes DA, Schulz KF. Grimes DA, et al. Among authors: schulz kf. Lancet. 2002 Jan 26;359(9303):341-5. doi: 10.1016/S0140-6736(02)07500-1. Lancet. 2002. PMID: 11830217
Case-control studies: research in reverse.
Schulz KF, Grimes DA. Schulz KF, et al. Lancet. 2002 Feb 2;359(9304):431-4. doi: 10.1016/S0140-6736(02)07605-5. Lancet. 2002. PMID: 11844534
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