After several appearances as a student, Callas began appearing in secondary roles at the Greek National Opera . De Hidalgo was instrumental in securing roles for her, allowing Callas to earn a small salary, which helped her and her family get through the difficult war years. 
These studies have been presented at professional conferences or informally presented, such as in books. They have not been peer reviewed and are thus not to be relied on for the empirical rigor that the review process brings. They should be regarded as suggestive only.
Oh, well written, you say? All of the grammatical errors and cherry-picked data?
As a high incidence of gallbladder disease (28 %) has been documented after surgery for morbid obesity, Aetna considers routine cholecystectomy medically necessary when performed in concert with elective bariatric procedures.
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