Charlotte, Frederic, Fleur Cohen-Aubart, Levi-Dan Azoulay, Zahir Amoura, Jean-Francois Emile, and Julien Haroche. 2022. “PD-1/PD-L1 Expression Is Frequent and Correlated With Lymphocyte Density in Erdheim-Chester Disease”. Haematologica 107 (8). Pavia, Italy, 1977-80. https://doi.org/10.3324/haematol.2021.280312.