Displayed Depression Symptoms on Facebook at Two Time Points: Content Analysis.

Background: Depression is a prevalent and problematic mental disorder that often has an onset in adolescence. Previous studies have illustrated that depression disclosures on social media are common and may be linked to an individual's experiences of depression. However, most studies have examined depression displays on social media at a single time point.

Early pregnancy maternal vitamin D concentrations and risk of gestational diabetes mellitus.

Background: While associations of vitamin D deficiency with type 2 diabetes have been well demonstrated, investigations of vitamin D and risk of gestational diabetes mellitus (GDM) reported inconsistent findings. We examined associations of vitamin D status with GDM.

Methods: In a nested case-cohort study (135 GDM cases and 517 non-GDM controls), we measured maternal serum vitamin D status (total 25[OH]D and 25[OH]D3 ) in early pregnancy (16 weeks on average) using liquid chromatography-tandem mass spectroscopy.

Reducing at-risk adolescents' display of risk behavior on a social networking web site: a randomized controlled pilot intervention trial.

Objective: To determine whether an online intervention reduces references to sex and substance abuse on social networking Web sites among at-risk adolescents.

Design: Randomized controlled intervention trial.

Setting: www.