#	Query	Results
S33	S20 AND S32	13
S32	S21 OR S22 OR S23 OR S24 OR S25 OR S26 OR S27 OR S28 OR S29 OR S30 OR S31	1,603,234
S31	TX allocat* random*	13,319
S30	(MH "Quantitative Studies")	30,611
S29	(MH "Placebos")	13,729
S28	TX placebo*	71,500
S27	TX random* allocat*	13,319
S26	(MH "Random Assignment")	68,389
S25	TX randomi* control* trial*	222,168
S24	TX ( (singl* n1 blind*) or (singl* n1 mask*) ) or TX ( (doubl* n1 blind*) or (doubl* n1 mask*) ) or TX ( (tripl* n1 blind*) or (tripl* n1 mask*) ) or TX ( (trebl* n1 blind*) or (trebl* n1 mask*) )	1,219,382
S23	TX clinic* n1 trial*	295,506
S22	PT Clinical trial	110,871
S21	(MH "Clinical Trials+")	320,131
S20	S9 AND S19	25
S19	S10 OR S11 OR S12 OR S13 OR S14 OR S15	7,886
S18	TX corinfar*	0
S17	TX cordipine*	0
S16	TX cordipin*	0
S15	TX Procardia*	21
S14	TX Adalat*	30
S13	TX calcium channel blocker*	6,131
S12	TX (calcium antagoni*)	1,293
S11	TX Nifedipine*	1,615
S10	(MM "Nifedipine")	579
S9	S1 OR S2 OR S3 OR S4 OR S5 OR S6 OR S7 OR S8	11,001
S8	TX(menstrua* N3 distress*)	158
S7	TX (menstrua* N3 pain*)	796
S6	TX (period* N3 cramp*)	27
S5	TX (pelvi* pain*)	5,321
S4	TX (menstrua* N3 cramp*)	149
S3	TX (pain* period*)	3,317
S2	TX Dysmenorr*	2,526
S1	(MM "Dysmenorrhea")	1,057