(Q46022991)
Statements
1 reference
Attrition and retention of ethnically diverse subjects in a multicenter randomized controlled research trial. (English)
1 reference
Asthma Clinical Trials Network
0 references
S L Janson
1 reference
M E Alioto
1 reference
H A Boushey
1 reference
Asthma Clinical Trials Network
1 reference
1 December 2001
1 reference
22
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6 Suppl
1 reference
236S-43S
1 reference