Table 2.

Characteristics of included studies

Study (year)	Number of patients			Randomization	Double blinding	Description of withdrawals/ dropouts	Validity score (Jadad et al. [14])
	Indomethacin	Radiation therapy	Control
Burd et al. [5] (2003)	72	78		Yes, inappropriate	No	Yes	2
Childs et al. [7] (2000)		82		No	No	No	0
Matta and Siebenrock [22] (1997)	61		46	Yes, inappropriate	No	No	1
Karunakar et al. [17] (2006)	63		64	Yes, appropriate	Yes	No	3
Iotov [13] (2000)	28		24	No	No	No	0
Total	224	160	134