However, by the beginning of the 20th century, the continued Serbian propaganda effort and especially the work of Cvijic had managed to firmly entrench the concept of the Macedonian Slavs in European public opinion, and the name was used almost as frequently as 'Bulgarians'. Even pro-Bulgarian researchers such as H. Henry Brailsford and N. Forbes argued that the Macedonian Slavs differed from both Bulgarians and Serbs. Practically all scholars before 1915, however, including strongly pro-Serbian ones such as Robert William Seton-Watson, admitted that the affinities of the majority of them lay with the Bulgarian cause and the Bulgarians and classified them as such. Even in 1914 the Carnegie Commission report states that the Serbs and Greeks classified the Slavs of Macedonia as a distinct group "Slav-Macedonians" for political purposes and this term is "political euphemism designed to conceal the existence of Bulgarians in Macedonia".