http://www.sec.gov/Archives/edgar/data/83246/000114420416108535/v442434_424b2.htm
http://www.sec.gov/Archives/edgar/data/844965/000119312516623787/d205498d424b5.htm
http://www.sec.gov/Archives/edgar/data/1499717/000156459016020616/staf-424b5_20160616.htm