TY - JOUR AN - 40 AU - Kalliomaki,M. AU - Salminen,S. AU - Poussa,T. TI - Probiotics and prevention of atopic disease: 4-year follow-up of a randomised placebo-controlled trial. JO - Lancet PY - 2003 VL - 361 SP - 1869-1871 M2 - 1869 DO - 10.1016/S0140-6736(03)13490-3 ER -