the influence of the reservoir on the vitamin b12 values could not be evaluated in 22 patients ( 9 % ) -- because of prophylactic treatment in 6 % , subnormal b12 values before the operation in 1 % , and 'treatment ' of various neurological symptoms not caused by vitamin b12 deficiency in 2 % .
C0042845
vitamin b12
C0042847
vitamin b12