GWO-FI: A novel machine learning framework by combining Gray Wolf Optimizer and Frequent Itemsets to diagnose and investigate effective factors on In-Hospital Mortality and Length of Stay among Kermanshahian Cardiovascular Disease patients. - Ali Yavari; Parisa Janjani; Sayeh Motavaseli; Seyran Weysi; Soraya Siabani; Mohammad Rouzbahani (CoRR, 2022)