@misc{Lidwall_Ulrik_Long-term,
 author={Lidwall, Ulrik and Bergendorff, Sisko and Voss, Margaretha and Marklund, Staffan},
 copyright={Lidwall, Urlik},
 copyright={Bergendorff, Sisko},
 copyright={Voss, Margaretha},
 copyright={Marklund, Staffan},
 howpublished={online},
 publisher={Instytut Medycyny Pracy w Łodzi im. prof. J. Nofera},
 publisher={Polskie Towarzystwo Medycyny Pracy},
 language={eng},
 type={czasopismo - artykuł},
 type={dokument piśmienniczy},
 title={Long-term sickness absence: changes in risk factors and the population at risk},
}