DEVELOPMENT AND VALUE EVALUATION OF PREDICTIVE MODELS FOR DETERMINING BLOOD SERUM FERRITIN LEVELS IN DIFFERENT CLINICAL GROUPS USING MACHINE LEARNING ArticleVyacheslavovich Varekha Nikolai, Stuklov Nikolai I., Gimadiev Rinat R., Gordienko K.V., Shchegolev O.B., Makarchev A.I., Gurkina A.A.Klinichescheskaya Laboratornaya Diagnostika. Том 70. 2025. С. 172-181