TY - JOUR AU - Martinez, M E TI - Physical activity, body mass index, and prostaglandin E2 levels in rectal mucosa JO - J Natl Cancer Inst VL - 91 PY - 1999 DO - 10.1093/jnci/91.11.950 L3 - PubMed-ID: 10359547 SP - 950 EP - 953 N1 - et al. ER -