title: Frequency of pain crisis during pregnancy.
mesh_terms: D000700:Analgesics / Q000627:therapeutic use; D000755:Anemia, Sickle Cell / Q000628:therapy*; D001803:Blood Transfusion; D005260:Female; D006445:Hemoglobin C Disease / Q000628:therapy*; D006801:Humans; D007238:Infarction / Q000517:prevention & control*; D010146:Pain / Q000517:prevention & control; D011247:Pregnancy; D011250:Pregnancy Complications, Hematologic / Q000628:therapy*; D011897:Random Allocation; D013789:Thalassemia / Q000628:therapy
chemical_list: D000700:Analgesics