primary nurseprimary nursingprimary objectivesprimary obligationprimary open angle glaucomaprimary packageprimary particlesprimary passive potentialprimary percutaneous coronary interventionprimary peritonitisprimary philosophyprimary phloemprimary pollutantprimary porosityprimary positionprimary postpartum hemorrhageprimary preventionprimary processprimary productivityprimary progressive msprimary radarprimary reflectionprimary refuseprimary religionprimary researchprimary responsibilityprimary rightsprimary schoolprimary sectorprimary sedimentation tankprimary sensory neuronprimary sludgeprimary sourceprimary sourcesprimary stageprimary storageprimary stressprimary structureprimary stutteringprimary substanceprimary successionprimary surface ruptureprimary surveillance radarprimary surveyprimary targetprimary teacherprimary termprimary tide stationprimary tillageprimary tissue