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Primary and secondary non-response: in need of operational definitions in observational studies

Authors

  1. Correspondence to Professor Andrea Michelle Burden, Department of Chemistry and Applied Biosciences, Institute of Pharmaceutical Sciences, ETH Zurich, Zurich CH-8093, Switzerland; andrea.burden{at}pharma.ethz.ch
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Citation

Vallejo-Yagüe E, Keystone EC, Kandhasamy S, et al
Primary and secondary non-response: in need of operational definitions in observational studies

Publication history

  • Received February 19, 2021
  • Revised April 6, 2021
  • Accepted April 8, 2021
  • First published April 21, 2021.
Online issue publication 
July 13, 2021

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