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The Withdrawal Delay Cohort under VM-21/AG-43: The case for random sampling

By Benjamin Buttin, Matthias Kullowatz, Zi Xiang Low, and Zohair Motiwalla
25 March 2019

About the Author(s)

Benjamin Buttin

Seattle Tel: 1 206 504 5959

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Matthias Kullowatz

Zi Xiang Low

Seattle Tel: 1 206 504-5525

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Zohair Motiwalla

Seattle Tel: 1 206 504 5918

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