lyly nazemi maternal, fetal and neonatal research center, tehran university of medical sciences, tehran, iran ; dept. of clinical nutrition, school of nutritional sciences and dietetic, tehran university of medical sciences, tehran, iran ; dept. of nutrition and biochemistry, school of public health, tehran university of medical sciences, tehran, iran. ingmar skoog dept. of psychiatry and neurochemistry, neuropsychiatric epidemiology unite, institute of neuroscience and physiology, sahlgrenska academy, university of gothenburg, sweden. ingvar karlsson dept. of psychiatry and neurochemistry, neuropsychiatric epidemiology unite, institute of neuroscience and physiology, sahlgrenska academy, university of gothenburg, sweden. saeed hosseini dept. of clinical nutrition, school of nutritional sciences and dietetic, tehran university of medical sciences, tehran, iran ; dept. of nutrition and biochemistry, school of public health, tehran university of medical sciences, tehran, iran. mohammad reza mohammadi psychiatry research center, rozbeh hospital, tehran university of medical sciences, tehran, iran. mostafa hosseini dept. of epidemiology and biostatistics, school of public health, tehran university of medical sciences, tehran, iran.

Esmat Rezabeigi Davarani, Mohammad Mehdi Fadakar, Mohammad Reza Mahmoodi, Narges Khanjani,

j. i. ruiz de galarreta r. lopez-pardo r. tierno n. alor l. barandalla