Media type: E-Article Title: Two-step sw allowing provocation test for elderly patients Contributor: Scott, Amanda; Perry, Alison imprint: Elsevier BV, 1999 Published in: The Lancet Language: English DOI: 10.1016/s0140-6736(05)76298-x ISSN: 0140-6736 Keywords: General Medicine Origination: Footnote: