US ratings study:
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_pro
CH ratings study:
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index1.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index2.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index3.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index4.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index5.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index6.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index7.html
https://homepage.univie.ac.at/gaspar.lukacs/repo/silhou_ch/index8.html