Original sentence: In three studies, the European Ramazzini Foundation of Oncology and Environmental Sciences (ERF) reported what they claimed was a dose-independent, statistically significant increase in several malignancies of rats, concluding that aspartame is a potential carcinogen at normal dietary doses
Edited sentence: In two widely criticised and later discounted studies, the European Ramazzini Foundation of Oncology and Environmental Sciences (ERF) reported what they claimed was a dose-independent, statistically significant increase in several malignancies of rats, concluding that aspartame is a potential carcinogen at normal dietary doses