Völker, D., Grünhage, F., Wagenpfeil, S., Lammert, F., & Stokes, C. S. (2019). Serum 25-hydroxyvitamin D levels and mortality risk in patients with liver cirrhosis: A protocol for a systematic review and meta-analysis of observational studies. Syst Rev.

Völker, Désirée, Frank Grünhage, Stefan Wagenpfeil, Frank Lammert, ja Caroline S. Stokes. "Serum 25-hydroxyvitamin D Levels and Mortality Risk in Patients With Liver Cirrhosis: A Protocol for a Systematic Review and Meta-analysis of Observational Studies." Syst Rev 2019.

Völker, Désirée, et al. "Serum 25-hydroxyvitamin D Levels and Mortality Risk in Patients With Liver Cirrhosis: A Protocol for a Systematic Review and Meta-analysis of Observational Studies." Syst Rev 2019.