The development of a Cancer Pain Belief Modification Program for patients with oral cancer in China: a feasibility study

Table 2 The pre-classification and evidence rank for included literatures (n = 24)

Literature	Country	Time	Study Design	Quality level	Grade of recommendation
Li [32]	China	2015	RCT	1c	A
Yang [33]	China	2020	RCT	1c	A
Zhu [34]	China	2016	RCT	1d	A
Guo [35]	China	2018	RCT	1c	A
Zhang [36]	China	2012	RCT	1d	B
Chen [37]	China	2014	RCT	1c	A
Fu [38]	China	2019	CCT	2d	A
Hu [39]	China	2007	RCT	1d	A
Li [40]	China	2013	CCT	1d	B
Sun [41]	China	2015	CCT	1d	B
Patsy [42]	Australia	2003	RCT	1c	A
Sandra [43]	USA	2009	RCT	1d	B
Mary [44]	USA	2012	RCT	1d	B
Yeur-Hur [45]	Taiwan, China	2014	RCT	1d	A
Yasemin [46]	Turkey	2009	RCT	1d	A
Barbara [47]	USA	1987	RCT	1d	B
Rianne [48]	Netherlands	2001	RCT	1c	B
Andreas [49]	Cyprus	2016	RCT	1c	A
Michèle [50]	Canada	2006	CCT	1d	B
Jennifer [51]	USA	2001	RCT	1d	B
Mimi [52]	Hong Kong, China	2012	RCT	1d	B
Tone [53]	Norway	2014	CCT	1d	A
Sandra [54]	USA	2008	RCT	1c	B
Sandra [55]	USA	2000	CCT	1d	B

ISSN: 1472-6955