“…Most of the selected papers were published since 2012. Fourteen different countries were included (ie Brazil, 9,[19][20][21][22][23][24][25][26][27] Canada, 22,25,28,29 China, [30][31][32][33] Germany, 34 Greece, 35 Israel, 36 Japan, 37 Holland, 32 Slovenia, 38,39 South Korea, 40 Singapore, 30,33 Sweden, 28,41 Turkey 42,43 and the USA 10,11,28,29,[35][36][37]39,[44][45][46][47][48][49][50][51] ). Most studies (n=31) 10,11,19-21,23,24,27-31,33-51 used the PSQI for subjective sleep quality assessment, and the RDC/TMD for TMD assessment (n = 28) [9]…”