No.	Query
#1	'influenza vaccine'/exp OR 'influenza vaccine' OR (influenza OR flu AND (vaccin* OR immuni* OR inoculat*)) OR 'influenza vaccine'/syn OR ('influenza'/exp AND 'vaccine'/exp)
#2	'case control study'/syn OR 'case control':de,ab,ti OR (cases:ab,ti AND controls:ab,ti) OR 'cohort analysis'/syn OR 'cohort study':de,ab,ti OR 'study cohort':de,ab,ti OR prospectiv*:ab,ti OR volunteer*:ab,ti OR observational:ab,ti OR 'clinical trial':it OR 'randomized controlled trial':it OR 'drug therapy'/exp OR 'drug therapy':de OR randomized:ab,ti OR randomised:ab,ti OR placebo:ab,ti OR randomly:ab,ti OR trial:ab,ti OR groups:ab,ti
#3	'clinical trial':it OR 'randomized controlled trial':it OR 'randomized controlled trial'/exp OR 'randomisation'/exp OR 'single blind procedure'/exp OR 'double blind procedure'/exp OR 'clinical trial'/exp OR 'clinical' NEAR/0 'trial' OR 'clinical trial' OR (singl* OR doubl* OR trebl* OR tripl* AND (mask* OR blind*)) OR 'placebo'/exp OR placebo* OR random* OR 'control group'/exp OR 'experimental design'/exp OR 'comparative study'/exp OR 'evaluation study' OR 'evaluation studies'/exp OR 'follow up'/exp OR 'prospective study'/exp OR control* OR prospectiv* OR volunteer* AND [humans]/lim
#4	#2 OR #3
#5	#1 AND #4
#6	#5 AND ([newborn]/lim OR [infant]/lim OR [child]/lim OR [adolescent]/lim)
#7	child*:de,ab,ti OR preschool*:de,ab,ti OR school*:de,ab,ti OR young:de,ab,ti OR adolescent*:de,ab,ti OR toddler*:de,ab,ti OR pediatric*:de,ab,ti OR paediatric*:de,ab,ti OR infant*:de,ab,ti
#8	#5 AND #7
#9	#6 OR #8