Toxicity and biological responses (in vitro) influenced by aggregation and agglomeration of manufactured nanomaterials, Murugadoss, Sivakumar, van den Brûle Sybille, Sebaihi Noham, Brassinne Frederic, Mast Jan, Godderis Lode, Lison Dominique, and Hoet Peter , Toxicology Letters, Jan-10-2017, Volume 280, (2017)