1. A system for producing structured clinical information from patient records, the system comprising: a patient record comprising at least two data sources having patient information, at least one of the data sources being an unstructured data source and at least one of the data sources being a structured data source; a probabilistic data miner of a computer platform configured to (a) extract multiple pieces of information related to a variable for a patient from mining structured data of the at least one structured data source and mining unstructured data of the at least one unstructured data source of the patient record, the mining of the at least one unstructured data source comprising mining free text information, and (b) combine the extracted multiple pieces of information related to the variable into a value of the variable for the patient, the value being a function of the multiple pieces related to the variable, and the data miner configured to repeat (a) and (b) for a plurality of different variables of the same patient for a same time, each repetition of extracting and combining multiple pieces of information related to the variable of the different variables being handled in the repetition such that the multiple pieces of information for one variable are different than the multiple pieces of information for other ones of the different variables, the variable and the different variables comprising characteristics of the patient at the time; wherein one or both of (a) and (b) are performed as a function of domain-specific criteria.