Bloem, Ada, Marcel Veltkamp, Martijn A. Spruit, Jan W.H. Custers, Eric W.P. Bakker, Hanneke M. Dolk, and Jan C. Grutters. 2018. “Validation of 4-Meter-Gait-Speed Test and 5-Repetitions-Sit-to-Stand Test in Patients With Pulmonary Fibrosis: A Clinimetric Validation Study”. Sarcoidosis, Vasculitis and Diffuse Lung Diseases 35 (4): 317-26. https://doi.org/10.36141/svdld.v35i4.7035.