barrier methods implant progestron injection progestron pills intra uterine divice transplantation solid organ metionine anti metablit drgs malnutrition bariatric srgery c677t mtation methyllen tetra hydrofolat vit b12 folat defficiensy hemocystein omphalocele celllardivision hypertention suppl fetal anomaly pregnancy pregna prenatal folic acid ntd
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