Observation:Prid:Pt:BAL:Nom:Methenamine silver nitrate stain
observation:prid:pt:bal:nom:methenamine silver nitrate stain
Observation:Presence or Identity:To identify measures at a point in time:BAL:Nominal:Methenamine silver nitrate stain
observation:presence or identity:to identify measures at a point in time:bal:nominal:methenamine silver nitrate stain