“…More in detail, machine learning can be applied to predict outcomes from recurring patterns of features within various types of multidimensional data sets [ 32 ]. Several authors have applied automatic classifiers based on machine learning analysis on voice recordings to classify healthy subjects according to their age and gender [ 24 , 25 , 26 , 27 , 28 , 33 , 34 , 35 , 36 , 37 , 38 ]. More recently, to further improve the overall accuracy of the machine learning analysis, several studies have included an increasing number of voice features in the datasets [ 24 , 25 , 26 , 27 , 28 ] and compared the performance of different machine learning algorithms [ 37 , 38 ].…”