The Lancet Respiratory Medicine
The Lancet Respiratory Medicine > 2013 > 1 > 3 > 241-250
The Lancet Respiratory Medicine > 2013 > 1 > 3 > 233-240
The Lancet Respiratory Medicine > 2013 > 1 > 3 > 224-232
The Lancet Respiratory Medicine > 2013 > 1 > 3 > 199-209