(en) Kelly GS. (1998) "Folates: supplemental forms and therapeutic applications.". Altern Med Rev, jrg.3 (nr.3): p. 208-220. PMID9630738gratis volledige artikel (na registratie)
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(en) Kelly GS. (1998) "Folates: supplemental forms and therapeutic applications.". Altern Med Rev, jrg.3 (nr.3): p. 208-220. PMID9630738gratis volledige artikel (na registratie)