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Exhausted emoji icon. Outline Exhausted emoji vector icon for web design isolated on white background color flat
gift present surprise icon sign vector
Confounded, face flat vector icon in emotions pack
Confounded, face flat vector icon in emotions pack
confounded face emoji vector icon
Emoji face with confounded emotion, squiggly mouth, closed eyes and scrunched mimicry. Unhappy, sad, depressed symbol. Emoticon icon isolated on white background. Vector graphic illustration.
A statistical rule of thumb for determining the minimum sample size needed for Propensity Score Matching (PSM) analysis.

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