The article is from 2001, the study you mention from 2002. Also that part was covered in my opinion, as the article states "Nor was the oil theory underpinned

The article is from 2001, the study you mention from 2002. Also that part was covered in my opinion, as the article states "Nor was the oil theory underpinned by any laboratory science. In the years since the 1981 outbreak, the suspect oils have been analysed in leading laboratories throughout the world. No chemical, or contaminant, that would account for the symptoms observed in the afectados has ever been found." Sure we could deplore the lack of citations. Of all the newspapers I read, only one lists sources at the end of the article. Unfortunately it's not common practice.