Article History
Received: 1 September 2017
Accepted: 22 June 2018
First Online: 12 July 2018
Change Date: 1 August 2018
Change Type: Correction
Change Details: This correction stands to correct Fig. 1 and Table 4 in the original article. This correction is due to Fig. 1 not having the red circles showing the strength of the socioeconomic gradient mean performance of the 10 selected countries. Additionally, some coefficients in Table 4 were not interpretable, which should be corrected.