open communication
open conformation
open conversion
open dialogue
open discussion
open donor nephrectomy
open economy
open field
open field test

open flap debridement
open flowers
open forest
open form
open fractures
open framework
open grassland
open group
open habitats
open heart surgery

open innovation
open interest
open issues
open label
open label study
open label trial
open landscapes
open literature
open loop
open lung biopsy

open market
open method
open mind
open model
open ocean
open operation
open part
open pollination
open populations
open pores

open porosity
open probability
open problem
open procedure