Examination and Validation of a Patient-Centric Joint Metric: "Problem Joint"; Empirical Evidence from the CHESS US Dataset - Burke, T; Santana, IR; Chowdary, P; Curtis, R; Khair, K; Laffan, M; McLaughlin, P; Noone, D; O'Mahony, B; Pasi, J; Skinner, MW; O'Hara, J (AMER SOC HEMATOLOGY, 2020)