Late administration of surfactant replacement therapy increases surfactant protein-B content: a randomized pilot study.
Keller RL, Merrill JD, Black DM, Steinhorn RH, Eichenwald EC, Durand DJ, Ryan RM, Truog WE, Courtney SE, Ballard PL, Ballard RA. Late administration of surfactant replacement therapy increases surfactant protein-B content: a randomized pilot study. Pediatr Res. 2012 Dec; 72(6):613-9.