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

Quality of pharmaceutical care at the pharmacy counter: patients’ experiences versus video observation by Koster ES, Blom L, Overbeeke MR, Philbert D, Vervloet M, Koopman L, van Dijk L

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Antibiotic therapy to prevent the development of asymptomatic middle ear effusion in children with acute otitis media: a meta-analysis of individual patient data. by Koopman, L, Hoes, A, Glasziou, P, Appelman, C, Burke, P, McCormick, D, Damoiseaux, R, Le Saux, N, Rovers, M