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Which of the following is true regarding the clinical features of thalassemias?

a. Are mild conditions rarely requiring treatment b. Are serious conditions requiring frequent blood transfusions c. Have abnormal red cells but little clinical implications for patients d. Vary from benign forms to those incompatible with life

What portion of the FVC maneuver is considered to be effort dependent?

A. last 10% B. first 30% C. first 10% D. last 30%