@article {Sayers:1 February 2008:0960-1643:136,
	author = "Sayers, Adrian",
	title = "Tips and tricks in performing a systematic review chapter 4",
	journal = "British Journal of General Practice",
	volume = "58",
	year = "1 February 2008",
	abstract = "",
	pages = "136-136(1)",
	url = "http://www.ingentaconnect.com/content/rcgp/bjgp/2008/00000058/00000547/art00026"
	doi = "doi:10.3399/bjgp08X277168"
}