Srinivasan T, Dedeepiya VDevaprasad, John S, Senthilkumar R, Reena HC, Rajendran P, Balamurugan M, Kurosawa G, Iwasaki M, Preethy S, et al. Smallpox still haunts scientists: results of a questionnaire-based inquiry on the views of health care and life science experts and students on preserving the remaining variola virus stocks. ScientificWorldJournal. 2013;2013:672813.