preferred_name: FRAXINUS AMERICANA POLLEN 20000 [PNU] in 1 mL / BETULA PAPYRIFERA POLLEN 20000 [PNU] in 1 mL / BETULA NIGRA POLLEN 20000 [PNU] in 1 mL / BETULA PENDULA POLLEN 20000 [PNU] in 1 mL / JUGLANS NIGRA POLLEN 20000 [PNU] in 1 mL / POPULUS DELTOIDES POLLEN 20000 [PNU] in 1 mL / ULMUS AMERICANA POLLEN 20000 [PNU] in 1 mL PERCUTANEOUS INJECTION, SOLUTION [Pollens - Trees, Tree Mix 6]