Immunological priming induced by a two-dose series of H5N1 influenza antigen, administered alone or in combination with two different formulations of AS03 adjuvant in adults: Results of a randomised single heterologous booster dose study at 15 monthsGeorge Risi; Louise Frenette; Joanne M. Langley; Ping Li; Dennis Riff; Eric Sheldon; David W. Vaughn; Louis Fries · 2011