first-best allocation
first-born child
first-degree family members
first-degree relatives
first-episode patients
first-episode psychosis
first-episode schizophrenia
first-ever ischemic stroke
first-ever stroke
first-ever stroke patients
first-generation antipsychotics
first-generation dendrimers

first-generation immigrants
first-grade students
first-hand experience
first-instar larvae
first-line agents
first-line chemotherapy
first species
first stage
first stars
first step
first stimulus
first structural characterization
first structure

first studies
first study
first study showing
first substrate
first successful use
first summer
first surgery
first survey
first symptoms
first target
first task
first term
first test

first time
first transition
first treatment
first treatment option
first trial
first trimester
first trimester screening
first twin
first type
first use
first used
first visit
first wave

first web space
first week
first winter
first woman
first work
first year
first year posttransplant