Long term stability of adsorption of Der s1 allergen onto alum at different phosphate ion concentrations. Issue 1 (December 2015) - Díaz, Roxana; González, Wendy; García, Deibbys; Morejón, Alain; Diaz, Yunia; Averoff, Damaris; Quintero, Arelis; Mateo, Maytee; Labrada, Alexis; Cruz, Raysa