From: Prophylactic cranial irradiation for patients with small-cell lung cancer: a systematic review of the literature with meta-analysis
Randomization
Concealment of allocation
Double blinding
Withdrawals and dropouts
Total
Gregor 1997 [11]
1
0
2
Laplanche 1998 [13]
3
Cao KJ 2005 [14]
Slotman 2007 [15]
Schild 2012 [8]