Search Terms	Search Options
S36	S23 AND S35
S35	S24 OR S25 OR S26 OR S27 OR S28 OR S29 OR S30 OR S31 OR S32 OR S33 OR S34
S34	TI (urethroplast*) or AB (urethroplast*)
S33	TI (urethrotom*) or AB (urethrotom*)
S32	TI (urethra* N25 dilat*) or AB (urethra* N25 dilat*)
S31	TI (urethra* N25 narrow*) or AB (urethra* N25 narrow*)
S30	TI (urethra* N25 stenos*) or AB (urethra* N25 stenos*)
S29	TI (urethra* N25 stricture*) or AB (urethra* N25 stricture*)
S28	"URETHRA" AND "DILATATION"
S27	"URETHRAL DILATATION"
S26	"URETHRA DILATATION"
S25	"SELF DILATATION"
S24	(MH "Urethral Stricture")
S23	S1 or S2 or S3 or S4 or S5 or S6 or S7 or S8 or S9 or S10 or S11 or S12 or S13 or S14 or S15 or S16 or S17 or S18 or S19 or S20 or S21 or S22
S22	TI ( singl* N25 blind* OR singl* N25 mask* OR doubl* N25 blind* or doubl* N25 mask* OR trebl* N25 blind* OR trebl* N25 mask*OR tripl* N25 blind* OR tripl* N25 mask* ) or AB ( singl* N25 blind* OR singl* N25 mask* OR doubl* N25 blind* or doubl* N25 mask* OR trebl* N25 blind* OR trebl* N25 mask*OR tripl* N25 blind* OR tripl* N25 mask* )
S21	(MH "Comparative Studies")
S20	(MH "Clinical Research+")
S19	(MH "Static Group Comparison")
S18	(MH "Quantitative Studies")
S17	(MH "Crossover Design") or (MH "Solomon Four‐Group Design")
S16	(MH "Factorial Design")
S15	(MH "Community Trials")
S14	(MH "Random Sample")
S13	TI balance* N2 block* or AB balance* N2 block*
S12	TI "latin square" or AB "latin square"
S11	TI factorial or AB factorial
S10	TI clin* N25 trial* or AB clin* N25 trial*
S9	(MH "Study Design")
S8	(AB random*) OR (TI random*)
S7	(AB placebo*) OR (TI placebo*)
S6	(MH "Placebos")
S5	PT Clinical Trial
S4	(MH "Clinical Trials+")
S3	MH (random assignment) OR (crossover design)
S2	cross‐over
S1	crossover