Development of a research agenda for general practice based on knowledge gaps identified in Dutch guidelines and input from 48 stakeholders oleh Jako S. Burgers, Jolanda Wittenberg, Debby G. Keuken, Frans Dekker, Femke P. Hohmann, Dieuwke Leereveld, Suzanne A. Ligthart, Jan-Willem A. Mulder, Guy Rutten, Johannes C. van der Wouden, Jacintha A. M. van Balen, J. André Knottnerus