# 5	113	#4 AND #3 Indexes=SCI‐EXPANDED, CPCI‐S, CCR‐EXPANDED Timespan=2013‐2018
# 4	719,817	TOPIC: ((random* or placebo* or allocat* or crossover* or "cross over" or ((doubl* or singl*) NEAR/1 (blind* or mask*)))) ORTITLE: (trial) Indexes=SCI‐EXPANDED, CPCI‐S, CCR‐EXPANDED Timespan=2013‐2018
# 3	498	#2 AND #1 Indexes=SCI‐EXPANDED, CPCI‐S, CCR‐EXPANDED Timespan=2013‐2018
# 2	6,232	TOPIC: ((pneumococc* NEAR/5 (vaccin* or conjugat* or immuni*))) ORTOPIC: ((pcv* or 5PPV* or 7PCV* or 9PCV* or 10PCV* or 11PCV* or 13PCV* or 15PCV* or synflorix)) Indexes=SCI‐EXPANDED, CPCI‐S, CCR‐EXPANDED Timespan=2013‐2018
# 1	15,363	TOPIC: ("otitis media" or aom or om or ome or csom or "glue ear" or otorrhea* or otorrhoea* or ("middle ear" NEAR/5 (infect* or inflam* or effus*))) Indexes=SCI‐EXPANDED, CPCI‐S, CCR‐EXPANDED Timespan=2013‐2018