1. Respiratory physiology in pregnancy;MJ Hegewald;Clin Chest Med,2011
2. Pregnancy and Infection;AP Kourtis;N Engl J Med,2014
3. Osterholm MT, Kelley NS, Manske JM, Ballering KS, Leighton TR, Moore KA. The Compelling Need for Game-Changing Influenza Vaccines, An Analysis of the Influenza Vaccine Enterprise and Recommendations for the Future. The Center for Infectious Disease Research and Policy (CIDRAP) at the University of Minnesota, October 2012. http://www.cidrap.umn.edu/sites/default/files/public/downloads/ccivi_report.pdf. Last accessed March 1st, 2015.
4. Influenza occurring in pregnant women: a statistical study of thirteen hundred and fifty cases;JW Harris;J Am Med Assoc,1919
5. Deaths from Asian influenza associated with pregnancy;DW Freeman;Am J Obstet Gynecol,1959