By Westin Steinar   Bakketeig Leiv S.   in Scandinavian Journal of Primary Health Care

ISSN:0281-3432|21|2|65-67

Informa Healthcare‎(2003)‎

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By Aabom Birgit   Kragstrup Jakob   Vondeling Hindrik   Bakketeig Leiv S   Støvring Henrik   in British Journal of General Practice

ISSN:1478-5242|55|518|684-689

Royal College of General Practitioners‎(2005)‎

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