Tami-Maury I, Vidrine DJ, Fletcher FE, Danysh H, Arduino R, Gritz ER. Poly-tobacco use among HIV-positive smokers: implications for smoking cessation efforts. Nicotine Tob Res. 2013 Dec;15(12):2100-6. doi: 10.1093/ntr/ntt107.
Mines D, Abbuhl SB. Hydroxyapatite pseudopodagra in a young man: acute calcific periarthritis of the first metatarsophalangeal joint. Am J Emerg Med. 1996 Mar;14(2):180-2.