Black CL, Yue X, Ball SW, Donahue SM, Izrael D, de Perio MA, Laney AS, Williams WW, Lindley MC, Graitcer SB, Lu PJ, Bridges CB, DiSogra C, Sokolowski J, Walker DK, Greby SM. Influenza Vaccination Coverage Among Health Care Personnel--United States, 2014-15 Influenza Season. MMWR Morb Mortal Wkly Rep. 2015 Sep 18; 64(36):993-9.