Nearly all of your links are broken. I think you copy-pasted the text of links that had been truncated with a "...", where the part prior to "..." is not suffic

Nearly all of your links are broken. I think you copy-pasted the text of links that had been truncated with a "...", where the part prior to "..." is not sufficient to constitute a valid web address. For instance, the link for Carvallo et al 2010 should be this, which resolves: https://medicalpressopenaccess.com/upload/1605709669_1007.pdf https://medicalpressopenaccess.com/upload/1605709669_1007.pd... ..rather than this, which doesn't: https://medicalpressopenaccess.com/up https://medicalpressopenaccess.com/up