1. A computer-implemented method for a medical risk stratification (MRS) computer system, comprising: obtaining data records associated with one or more health variables and a plurality of medical risks from a plurality of MRS models based on an expert knowledge combination process, wherein the health variables represent health information of one or more people; establishing a medical risk process model indicative of interrelationships between the plurality of medical risks and a plurality of health parameters based on the data records; obtaining a set of values corresponding to the plurality of health parameters; calculating values of the plurality of medical risks simultaneously based upon the set of values corresponding to the plurality of health parameters and the medical risk process model; optimizing the plurality of health parameters to minimize the plurality of medical risks simultaneously; and presenting the values of the plurality of medical risks via the MRS computer system.