TY - RPRT TI - The patient judgment system: reliability and validity. AU - E C Nelson AU - R D Hays AU - C Larson AU - P B Batalden PY - 1989 DO - 10.1016/s0097-5990(16)30290-1 UR - https://pubmed.ncbi.nlm.nih.gov/2502749/ ID - 2502749 ER -