It appears that at least two mobile internet providers are blocking access to NIH studies. For instance, I was unable to load this from my phone using 4G and had to connect using separate wifi. Several others have confirmed this. For instance:<p>https://www.ncbi.nlm.nih.gov/m/pubmed/21716201/<p>If you're unable to view the link, it discusses the carcinogenic effects of low intensity microwave radiation from devices such as mobile phones and wireless modems.<p>Edit: Appears that all NIH studies are blocked, e.g.,<p>https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3746332/<p>So perhaps it's a DDOS prevention routing issue.
It appears that the National Toxicology Program site is blocked as well by specific internet providers:<p><a href="http://ntp.niehs.nih.gov" rel="nofollow">http://ntp.niehs.nih.gov</a>