A computer-processor system for matching a pair of patient records as belonging to the same individual or patient, wherein the pair of patient records comprises a first patient record and a second patient record, the system comprising: - a set of matching rules representing persistent characteristics of clinical properties of patients; - a clinical property extractor for extracting at least one first clinical property from clinical information contained in the first patient record and at least one second clinical property from clinical information contained in the second patient record; - a match detector for detecting whether the first patient record and the second patient record relate to the same patient, based on the first clinical property, the second clinical property, and the set of matching rules; - a demographic property extractor for extracting first demographic data from the first patient record and second demographic data from the second patient record, wherein the match detector is arranged for performing the detecting also based on the first demographic data and the second demographic data, wherein the match detector comprises: - a demographic match evaluator for evaluating the first demographic data and the second demographic data in order to classify the pair of patient records (1,2) as at least one of matching, not matching, or undetermined; and - a clinical match evaluator for evaluating the first clinical property and the second clinical property if the pair of patient records (1,2) is classified as undetermined by the demographic match evaluator. - a set of matching rules representing persistent characteristics of clinical properties of patients; - a clinical property extractor for extracting at least one first clinical property from clinical information contained in the first patient record and at least one second clinical property from clinical information contained in the second patient record; - a match detector for detecting whether the first patient record and the second patient record relate to the same patient, based on the first clinical property, the second clinical property, and the set of matching rules; - a demographic property extractor for extracting first demographic data from the first patient record and second demographic data from the second patient record, wherein the match detector is arranged for performing the detecting also based on the first demographic data and the second demographic data, wherein the match detector comprises: - a demographic match evaluator for evaluating the first demographic data and the second demographic data in order to classify the pair of patient records (1,2) as at least one of matching, not matching, or undetermined; and - a clinical match evaluator for evaluating the first clinical property and the second clinical property if the pair of patient records (1,2) is classified as undetermined by the demographic match evaluator. - a demographic match evaluator for evaluating the first demographic data and the second demographic data in order to classify the pair of patient records (1,2) as at least one of matching, not matching, or undetermined; and - a clinical match evaluator for evaluating the first clinical property and the second clinical property if the pair of patient records (1,2) is classified as undetermined by the demographic match evaluator.