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OHPC was studied by Schering for use as a progestogen-only injectable contraceptive at a dose of 250 to 500 " mg once a month by intramuscular injection but produced poor cycle control at these doses and was never marketed .
 Schering
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Schering