In this phase II , multicenter , observer-blind study ( www.clinicaltrials.gov : NCT@ ) conducted in the Czech Republic , toddlers ( @-@ months ) were randomized ( @:@:@:@:@ ) to receive one of four investigational vaccine formulations ( @ or @g each of dPly and PhtD , alone or in combination with polysaccharide conjugates from the pneumococcal non-typeable Haemophilus influenzae protein-D conjugate vaccine -LSB- PHiD-CV -RSB- ) , or the licensed PHiD-CV , in a @-dose primary series plus booster at study months @ , @ and @ .