2. Primary sites of disease.

	Breast	Lung	Prostate	Ovary	Gastrointestinal	Genitourinary	Uterus	Other	Not specified
Basile 2012					x			x
Bruera 1985	x	x	x	x				x
Bruera 2004	x	x		x	x	x
Della 1989	x	x	x		x		x	x
Fossa 2001			x
Graham 2006	x	x	x		x	x
Lauretti 2013	x	x	x				x	x
Lee 2008								x
Mercadante 2007									x
Paulsen 2014	x	x	x	x	x
Popiela 1989									x
Teshima 1996								x
Twycross 1985	x	x
Vecht 1989									x
Yennurajalingam 2013	x	x			x	x	x	x