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HARVARD Citation
Vallejo-Yagüe, E. et al. (2021). Primary and secondary non-response: in need of operational definitions in observational studies. Annals of the rheumatic diseases. 80 (8), pp. 961-964. [Online].
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Vallejo-Yagüe, E. et al. (2021). Primary and secondary non-response: in need of operational definitions in observational studies. Annals of the rheumatic diseases. 80 (8), pp. 961-964. [Online].