Ramsey SD, Sullivan SD. Chronic obstructive pulmonary disease: is there a case for early intervention? Am J Med. 2004 Dec 20;117 Suppl 12A:3S-10S. Review.
Ramsey SD, Sullivan SD. Chronic obstructive pulmonary disease: is there a case for early intervention? Am J Med. 2004 Dec 20;117 Suppl 12A:3S-10S. Review.