Current state of knowledge on the health effects of engineered nanomaterials in workers: a systematic review of human studies and epidemiological investigations by Schulte PA, Leso V, Niang M, Iavicoli I This paper offers the reader a comprehensive and updated view of the possible health effects of individual types of engineered nanomaterials. It tracks epidemiological studies (and complimentary animal studies) of workers potentially exposed to nine of the highest volume engineered nanomaterials in commerce. Implications for biological monitoring were also extrapolated from the review.