1. The measurement of free erythrocyte porphyrin (FEP) as a simple means of distinguishing iron deficiency from beta-thalassemia trait in subjects with microcytosis;Stockman;J Lab Clin Med,1975
2. Free erythrocyte protoporphyrin concentration: A promising screening test for lead poisoning;Piomelli;Pediatr Res,1972
3. The FEP (free erythrocyte porphyrins) test: A screening micromethod for lead poisoning;Piomelli;Pediatrics,1973
4. Rapid protoporphyrin quantitation for detection of lead poisoning;Kammholz;Pediatrics,1972
5. A simple protoporphyrin assay-microhematocrit procedure as a screening technique for increased lead absorption in young children;Chisolm;J Pediatr,1974