- Serum and lower respiratory tract drug concentrations after tobramycin inhalation in young children with cystic fibrosis. Rosenfeld, M., Gibson, R., McNamara, S., Emerson, J., McCoyd, K.S., Shell, R., Borowitz, D., Konstan, M.W., Retsch-Bogart, G., Wilmott, R.W., Burns, J.L., Vicini, P., Montgomery, A.B., Ramsey, B. J. Pediatr. (2001)