By Goudswaard Alex N.   Stolk Ronald P.   Zuithoff Peter   Rutten Guy E.H.M.   in European Journal of Epidemiology

ISSN:0393-2990|19|6|541-545

Springer Publishing Company ‎(2004)‎

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By van Bruggen Rykel   Gorter Kees   Stolk Ronald   Zuithoff Peter   Verhoeven Rob   Rutten Guy   in British Journal of General Practice

ISSN:1478-5242|58|550|339-345

Royal College of General Practitioners‎(2008)‎

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