Vitamin B12 deficiency--need for a new guideline.
Chui CH, Lau FY, Wong R, Soo OY, Lam CK, Lee PW, Leung HK, So CK, Tsoi WC, Tang N, Lam WK, Cheng G.
Chui CH, et al.
Nutrition. 2001 Nov-Dec;17(11-12):917-20. doi: 10.1016/s0899-9007(01)00666-9.
Nutrition. 2001.
PMID: 11744340