Sibling terms	Pain terms	Child terms29
Siblings Sibling Twins Twin Sister Brother Multiple birth offspring	Chronic pain terms27: pain* fibromyalgia irritable bowel syndrome arthrit* osteoarthrit* headache* migraine* neuralgi* neuropath* complex regional pain syndrome chronic pain arthritis osteoarthritis headache migraine neuralgia peripheral nervous system diseases Experimental pain terms28: experimental pain cold pressor quantitative sensory test water load heat pain thermal pain pressure pain exercise task Procedural pain terms: needle surgery puncture operation blood draw	Infan* newborn* new-born* perinat* neonat* baby baby* babies toddler* minors minors* boy boys boyfriend boyhood girl* kid kids child child* children* schoolchild* schoolchild school child adolescen* juvenil* youth* teen* under*age* pubescen* pediatrics pediatric* paediatric* peadiatric* school school* prematur* preterm*
Pub Med search format: “siblings”[MeSH] OR sibling*[tw] OR “Twins”[MeSH] OR Twin*[tw] OR sister*[tw] OR brother*[tw] OR “Multiple Birth Offspring”[MeSH]	Pub Med search format: Pain*[tiab] OR Fibromyalgia[tiab] OR Irritable bowel syndrome[tiab] OR Arthrit*[tiab] OR Osteoarthrit*[tiab] OR Headache*[tiab] OR Migraine*[tiab] OR Neuralgi*[tiab] OR Neuropath*[tiab] OR Complex regional pain syndrome[tiab] OR Pain[MeSH:NoExp] OR Chronic Pain[MeSH] OR Fibromyalgia[MeSH:NoExp] OR Irritable Bowel Syndrome[MeSH:NoExp] OR Arthritis[MeSH:NoExp] OR Osteoarthritis[MeSH:NoExp] OR Headache[MeSH:NoExp] OR Migraine[MeSH:NoExp] OR Neuralgia[MeSH:NoExp] OR Peripheral Nervous System Diseases[MeSH:NoExp] OR Complex Regional Pain Syndromes[MeSH:NoExp] OR Needle[tiab] OR Surgery[tiab] OR Puncture[tiab] OR Operation[tiab] OR Blood draw[tiab] OR experimental pain[tiab] OR cold pressor[tiab] OR quantitative sensory test[tiab] OR water load[tiab] OR heat pain[tiab] OR thermal pain[tiab] OR pressure pain[tiab] OR exercise task[tiab]	Pub Med search format: Infan* OR newborn* OR new-born* OR perinat* OR neonat* OR baby OR baby* OR babies OR toddler* OR minors OR minors* OR boy OR boys OR boyfriend OR boyhood OR girl* OR kid OR kids OR child OR child* OR children* OR schoolchild* OR schoolchild OR school child[tiab] OR school child*[tiab] OR adolescen* OR juvenil* OR youth* OR teen* OR under*age* OR pubescen* OR pediatrics[MeSH] OR pediatric* OR paediatric* OR peadiatric* OR school[tiab] OR school*[tiab] OR prematur* OR preterm*
Cinahl search format: MH “siblings” OR TX sibling* OR MH “Twins” OR TX Twin* OR TX sister* OR TX brother* OR MH “Multiple Birth Offspring”	Cinahl search format: TI Pain* OR AB Pain* OR TI Fibromyalgia OR AB Fibromyalgia OR TI Irritable bowel syndrome OR AB Irritable bowel syndrome OR TI Arthrit* OR AB Arthrit* OR TI Osteoarthrit* OR AB Osteoarthrit* OR TI Headache* OR AB Headache* OR TI Migraine* OR AB Migraine* OR TI Neuralgi* OR AB Neuralgi* OR TI Neuropath* OR AB Neuropath* OR TI Complex regional pain syndrome OR AB Complex regional pain syndrome OR MH Pain OR MH Chronic Pain OR MH Fibromyalgia OR MH Irritable Bowel Syndrome OR MH Arthritis OR MH Osteoarthritis OR MH Headache OR MH Migraine OR MH Neuralgia OR MH Peripheral Nervous System Diseases OR MH Complex Regional Pain Syndromes OR TI Needle OR AB Needle OR TI Surgery OR AB Surgery OR TI Puncture OR AB Puncture OR TI Operation OR AB Operation OR TI Blood draw OR AB Blood draw OR TI experimental pain OR AB experimental pain OR TI cold pressor OR AB cold pressor OR TI quantitative sensory test OR AB quantitative sensory test OR TI water load OR AB water load OR TI heat pain OR AB heat pain OR TI thermal pain OR AB thermal pain OR TI pressure pain OR AB pressure pain OR TI exercise task OR AB exercise task	Cinahl search format: Infan* OR newborn* OR new-born* OR perinat* OR neonat* OR baby OR baby* OR babies OR toddler* OR minors OR minors* OR boy OR boys OR boyfriend OR boyhood OR girl* OR kid OR kids OR child OR child* OR children* OR schoolchild* OR schoolchild OR TI school child OR AB school child OR TI school child* OR AB school child* OR adolescen* OR juvenil* OR youth* OR teen* OR under*age* OR pubescen* OR MH pediatrics OR pediatric* OR paediatric* OR peadiatric* OR TI school OR AB school OR TI school* OR AB school* OR prematur* OR preterm*
PsycINFO search format: DE “siblings” OR TX sibling* OR DE “Twins” OR TX Twin* OR TX sister* OR TX brother* OR DE “Multiple Birth Offspring”	PsycINFO search format: TI Pain* OR AB Pain* OR TI Fibromyalgia OR AB Fibromyalgia OR TI Irritable bowel syndrome OR AB Irritable bowel syndrome OR TI Arthrit* OR AB Arthrit* OR TI Osteoarthrit* OR AB Osteoarthrit* OR TI Headache* OR AB Headache* OR TI Migraine* OR AB Migraine* OR TI Neuralgi* OR AB Neuralgi* OR TI Neuropath* OR AB Neuropath* OR TI Complex regional pain syndrome OR AB Complex regional pain syndrome OR DE Pain OR DE Chronic Pain OR DE Fibromyalgia OR DE Irritable Bowel Syndrome OR DE Arthritis OR DE Osteoarthritis OR DE Headache OR DE Migraine OR DE Neuralgia OR DE Peripheral Nervous System Diseases OR DE Complex Regional Pain Syndromes OR TI Needle OR AB Needle OR TI Surgery OR AB Surgery OR TI Puncture OR AB Puncture OR TI Operation OR AB Operation OR TI Blood draw OR AB Blood draw OR TI experimental pain OR AB experimental pain OR TI cold pressor OR AB cold pressor OR TI quantitative sensory test OR AB quantitative sensory test OR TI water load OR AB water load OR TI heat pain OR AB heat pain OR TI thermal pain OR AB thermal pain OR TI pressure pain OR AB pressure pain OR TI exercise task OR AB exercise task	PsycINFO search format: Infan* OR newborn* OR new-born* OR perinat* OR neonat* OR baby OR baby* OR babies OR toddler* OR minors OR minors* OR boy OR boys OR boyfriend OR boyhood OR girl* OR kid OR kids OR child OR child* OR children* OR schoolchild* OR schoolchild OR TI school child OR AB school child OR TI school child* OR AB school child* OR adolescen* OR juvenil* OR youth* OR teen* OR under*age* OR pubescen* OR DE pediatrics OR pediatric* OR paediatric* OR peadiatric* OR TI school OR AB school OR TI school* OR AB school* OR prematur* OR preterm*
Embase search format: “siblings”/exp OR sibling* OR “Twins”/exp OR Twin* OR sister* OR brother* OR “Multiple Birth Offspring”/exp	Embase search format: Pain*:ti,ab OR Fibromyalgia:ti,ab OR “Irritable bowel syndrome”:ti,ab OR Arthrit*:ti,ab OR Osteoarthrit*:ti,ab OR Headache*:ti,ab OR Migraine*:ti,ab OR Neuralgi*:ti,ab OR Neuropath*:ti,ab OR “Complex regional pain syndrome”:ti,ab OR ‘Pain’/exp OR ‘Chronic Pain’/exp OR ‘Fibromyalgia’/exp OR ‘Irritable Bowel Syndrome’/exp OR ‘Arthritis’/exp OR ‘Osteoarthritis’/exp OR ‘Headache’/exp OR ‘Migraine’/exp OR ‘Neuralgia’/exp OR ‘Peripheral Nervous System Diseases’/exp OR ‘Complex Regional Pain Syndromes’/exp OR Needle:ti,ab OR Surgery:ti,ab OR Puncture:ti,ab OR Operation:ti,ab OR “Blood draw”:ti,ab OR “experimental pain”:ti,ab OR “cold pressor”:ti,ab OR “quantitative sensory test”:ti,ab OR “water load”:ti,ab OR “heat pain”:ti,ab OR “thermal pain”:ti,ab OR “pressure pain”:ti,ab OR “exercise task”:ti,ab	Embase search format: Infan* OR newborn* OR new-born* OR perinat* OR neonat* OR baby OR baby* OR babies OR toddler* OR minors OR minors* OR boy OR boys OR boyfriend OR boyhood OR girl* OR kid OR kids OR child OR child* OR children* OR schoolchild* OR schoolchild OR “school child”:ti,ab OR “school child*”:ti,ab OR adolescen* OR juvenil* OR youth* OR teen* OR under* NEXT/1 age* OR pubescen* OR ‘pediatrics’/exp OR pediatric* OR paediatric* OR peadiatric* OR school:ti,ab OR school*:ti,ab OR prematur* OR preterm*
Web of Science search format: “siblings” OR sibling* OR “Twins” OR Twin* OR sister* OR brother* OR “Multiple Birth Offspring”	Web of Science search format: Pain* OR Fibromyalgia OR Irritable bowel syndrome OR Arthrit* OR Osteoarthrit* OR Headache* OR Migraine* OR Neuralgi* OR Neuropath* OR Complex regional pain syndrome OR Pain OR Chronic Pain OR Fibromyalgia OR Irritable Bowel Syndrome OR Arthritis OR Osteoarthritis OR Headache OR Migraine OR Neuralgia OR Peripheral Nervous System Diseases OR Complex Regional Pain Syndromes OR Needle OR Surgery OR Puncture OR Operation OR Blood draw OR experimental pain OR cold pressor OR quantitative sensory test OR water load OR heat pain OR thermal pain OR pressure pain OR exercise task	Web of Science search format: Infan* OR newborn* OR new-born* OR perinat* OR neonat* OR baby OR baby* OR babies OR toddler* OR minors OR minors* OR boy OR boys OR boyfriend OR boyhood OR girl* OR kid OR kids OR child OR child* OR children* OR schoolchild* OR schoolchild OR school child OR school child* OR adolescen* OR juvenil* OR youth* OR teen* OR under*age* OR pubescen* OR pediatrics OR pediatric* OR paediatric* OR peadiatric* OR school OR school* OR prematur* OR preterm*