Table 1.
PubMed search results
Keywords
1980–1989
1990–1999
2000–2009
2010–May 2012
Idiopathic pulmonary fibrosis
249
577
1577
770
Lymphangioleiomyomatosis
39
170
472
163
Pulmonary Langerhans’ cell histiocytosis
142
201
291
74