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Aten Primaria. 2013 Feb;45(2):71-3. doi: 10.1016/j.aprim.2012.09.003. Epub 2012 Nov 9.

[Recruitment difficulties for clinical trials in primary care. When sample size is not reached].

[Article in Spanish]
PMID:
23142032
DOI:
10.1016/j.aprim.2012.09.003
[Indexed for MEDLINE]
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