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Van De Bovenkamp, A., Wijkstra, N., Braams, N., Jansen, M., Oosterveer, F., Bogaard, H., Van Rossum, A., De Man, F., & Handoko, M. (n.d.). the diagnostic value of passive leg raise during right heart catheterization in diagnosing heart failure with preserved ejection fraction. European heart journal, 41, . http://access.bl.uk/ark:/81055/vdc_100115126386.0x000032