1. The ‘evil twin syndrome’ in chronic pelvic pain: A systematic review of prevalence studies of bladder pain syndrome and endometriosis 
S.A. Tirlapur, K. Kuhrt, C. Chaliha, E. Ball, C. Meads, K.S. Khan 
International Journal of Surgery 
Volume 11, Issue 3, Pages (April 2013)
DOI: /j.ijsu
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2. Fig. 1
Study selection for a systematic review on prevalence of bladder pain syndrome amongst women with chronic pelvic pain.
International Journal of Surgery  , DOI: ( /j.ijsu )
Copyright © 2013 Surgical Associates Ltd Terms and Conditions

3. Fig. 2
Quality of studies included in the systematic review of the prevalence of bladder pain syndrome and endometriosis.
International Journal of Surgery  , DOI: ( /j.ijsu )
Copyright © 2013 Surgical Associates Ltd Terms and Conditions

4. Fig. 3
Prevalences of bladder pain syndrome (BPS), endometriosis and co-existing BPS and endometriosis amongst women with chronic pelvic pain (CPP).
International Journal of Surgery  , DOI: ( /j.ijsu )
Copyright © 2013 Surgical Associates Ltd Terms and Conditions