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Methodological context for: Dieckmann WJ, Adair FL, Michel H, Kramer S, Dunkle F, Arthur B, Costin M, Campbell A, Wensley AC, Lorang E (1944). Calcium, phosphorus, iron and nitrogen balances in pregnant women. American Journal of Obstetrics and Gynecology 47:357-368.
- Allocation bias
- Differences between the people compared