Comparing Participants and Nonparticipants in a Smoking Cessation Trial: Selection Factors Associated With General Practitioner Recruitment Activity
| Autor: | Senore, Carlo 1, *, Battista, Renaldo N 3, Ponti, Antonio 1, Segnan, Nereo 1, Shapiro, Stanley H 2, Rosso, Stefano 1, Aimar, Daniela 1 |
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| Zdroj: | In Journal of Clinical Epidemiology 1999 52(1):83-89 |
| Databáze: | ScienceDirect |
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