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w3 Jefferson T, Demicheli V. Observational data on harm is already included in systematic reviews [electronic response to Cuervo LG, Clarke M. Balancing benefits and harms in health care]. BMJ 2003. http://bmj.bmjjournals.com/cgi/eletters/327/7406/65#34417

w4 Garner SE, Eady EA, Popescu C, Newton J, Li Wan Po A. Minocycline for acne vulgaris: efficacy and safety. Cochrane Database Syst Rev 2003;(1):CD002086.

w5 Croft AMJ, Garner P. Mefloquine for preventing malaria in non-immune adult travellers. Cochrane Database Syst Rev 2000;(4):CD000138.

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