Preterm labor Classification (of information) Electrical activities Electrohysterogram Electrohysterography Electrophysiology Entropy Feature Feature Selection Feature selection methods Forecasting Genetic algorithms Imbalance data learning Imbalance datum Machine-learning Multi channel Non-invasive monitoring Pregnant woman Preterm birth Preterm labor prediction Resampling method Statistical tests Term delivery Time to delivery Under-sampling Uterine electromyography electrohysterogram electrohysterography features genetic algorithm