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Which of the following is a major weakness of the cross-sectional study?

A

Cross-sectional studies take much longer to conduct than longitudinal ones.

B

Cross-sectional studies require more subjects than longitudinal ones require.

C

Cross-sectional studies may be undermined by the cohort effect.

D

Cross-sectional studies are more prone to placebo effects than other types of studies.

E

Cross-sectional studies cannot establish cause and effect; while longitudinal ones always can.

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