"I don't think those studies were about long term re-using PET. They were just saying that if you buy food in PET containers, it's safe."
I couldn't get the University of FL link to work but after going down that rabbit trail, I found this one:
http://web.archive.org/web/20050830052647/http:/www.jhsph.edu/PublicHealthNews/articles/Halden_dioxins.html
"OC&PA: So it’s okay for people to drink out of plastic water bottles?
RH: First, people should be more concerned about the quality of the water they are drinking rather than the container it’s coming from. Many people do not feel comfortable drinking tap water, so they buy bottled water instead. The truth is that city water is much more highly regulated and monitored for quality. Bottled water is not. It can legally contain many things we would not tolerate in municipal drinking water.
Having said this, there is another group of chemicals, called phthalates that are sometimes added to plastics to make them flexible and less brittle. Phthalates are environmental contaminants that can exhibit hormone-like behavior by acting as endocrine disruptors in humans and animals. If you heat up plastics, you could increase the leaching of phthalates from the containers into water and food."
The following source seems to be biased but they claim that PET bottles do not contain phthalates:
http://www.petresin.org/science_behindpet.asp
"PET contains no phthalates. Phthalates (i.e., phthalate ester plasticizers or orthophthalates) are not used in PET, nor is PET a phthalate. Plasticizer phthalates are sometimes used to soften other types of plastic, and are believed by some to be potential endocrine disruptors although this is unproven. The confusion seems to come from PET's chemical name, polyethylene terephthalate. Despite the suffix, PET is not a plasticizer phthalate. Phthalates are low molecular weight monoesters made from ortho-phthalic acid. PET is a high molecular weight polyester made from tere-phthalic acid. They are completely different chemicals."