Cita APA (7th ed.)

Koopman, L., van der Heijden, G., Glasziou, P., Grobbee, D., & Rovers, M. (2007). A systematic review of analytical methods used to study subgroups in (individual patient data) meta-analyses.

Cita Chicago (17th ed.)

Koopman, L., G. van der Heijden, P. Glasziou, D. Grobbee, i M. Rovers. A Systematic Review of Analytical Methods Used to Study Subgroups in (individual Patient Data) Meta-analyses. 2007.

Cita MLA (9th ed.)

Koopman, L., et al. A Systematic Review of Analytical Methods Used to Study Subgroups in (individual Patient Data) Meta-analyses. 2007.