Meningococcal vaccine trial in Norway.
Fine
P E
PE
D001428:Bacterial Vaccines / Q000008:administration & dosage*; D006801:Humans; D008589:Meningococcal Infections / Q000517:prevention & control*; D022401:Meningococcal Vaccines; D009664:Norway; D011897:Random Allocation
D001428:Bacterial Vaccines; D022401:Meningococcal Vaccines