bibliographicCitation |
Pfaffenrath V, Diener HC, Pageler L, Peil H, Aicher B. OTC analgesics in headache treatment: open-label phase vs randomized double-blind phase of a large clinical trial. Headache. 2009 May;49(5):638–45. doi: 10.1111/j.1526-4610.2009.01402.x. PMID: 19472437. |