2623971 ECOC error correcting output codes 49 2623970 ECOC elemental and organic carbon 12 2623976 ECOC endometriosis-correlated ovarian cancer 2 2623977 ECOC European Conference on Optical Communication and Exhibition 2 2623980 ECOC extended cycle oral contraception 2 2623979 ECOC 50-Error Correcting Output Code 1 2623978 ECOC Eastern Christian Orthodox Church 1 2623972 ECOC enzyme-catalyzed oxidative coupling 1 2623975 ECOC estrogen containing oral contraceptives 1 2623974 ECOC ethical concerns about online counseling 1 2623973 ECOC exhaled CO concentration 1 2623981 ECOC exposure condition category 1