The Method Quality of Cross-Over Studies Involved in Cochrane Systematic Reviews Ding, Hong ; Hu, Guang Li ; Zheng, Xue Yan ; Chen, Qing ; Threapleton, Diane Erin ; Zhou, Zeng Huan Abstract Publication: PLoS ONE Pub Date: April 2015 DOI: 10.1371/journal.pone.0120519 Bibcode: 2015PLoSO..1020519D