van Dooijeweert B, Broeks MH, Verhoeven-Duif NM, van Beers EJ, Nieuwenhuis EE, van Solinge WW, Bartels M, Jans JJ, van Wijk R. Untargeted metabolic profiling in dried blood spots identifies disease fingerprint for pyruvate kinase deficiency. Haematologica 2021;106(10):2720-2725; https://doi.org/10.3324/haematol.2020.266957.