Karin Michaels, Associate Professor at Harvard Medical School, suggests that toxins leaching from plastics might be related to disorders in humans such as endocrine disruption.Plastic water bottle plants hold a low priority for inspection due to a continuously good safety record.[16] In 2018, research conducted by Sherri Mason from the State University of New York in Fredonia revealed the presence of polypropylene, polystyrene, nylon and polyethylene terephthalate microparticles in plastic bottles.[17] The research was reviewed by Andrew Mayes of the University of East Anglia (UEA) School of Chemistry[18] The European Food Safety Authority suggested most microplastics are excreted by the body, however the UN Food and Agriculture Organization warned that it is possible that the smallest particles (< 1.5 μm) could enter the bloodstream and organs, via the intestinal wall.For example, in poor countries, empty two-liter soda bottles have been reused as an improvised personal flotation device to prevent drowning.