Compared with direct observation of outpatient visits, the NAMCS physician report method is more accurate for procedures and examinations than for health behavior counseling. Underreporting of behavioral counseling and overreporting of visit duration should lead to caution in interpreting findings based on these variables.
They estimated that this was in excess of the number that would be expected by chance. However, familial cases of myeloma do not differ from sporadic cases in terms of age at onset, sex distribution, symptoms and signs, laboratory and radiologic data, bone marrow findings, serum and urine electrophoresis, or course and pr~gnosis.~*~ Such similarities in the behavior of familial and sporadic cases do not suggest different disease entities with different etiologies.
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