The timeline of MOS including traditional approaches [11, 14, 20, 28, 29, 53, 68, 72, 84–86, 131, 145, 182, 185, 208, 211] and deep learning approaches [3, 8, 9, 21, 32, 43, 63, 74–76, 78, 88, 96, 105, 109, 110, 112, 123, 127, 129, 133, 134, 141, 142, 147, 151, 152, 159–161, 170, 171, 175, 187, 193, 194, 198, 203, 206, 207, 210, 216, 217, 222, 225, 232, 240, 254].