What is the best biomarker to assess arsenic exposure via drinking water?

Arsenic (As) is a ubiquitous element. The current WHO guideline for As in drinking water is 10 μg/L. Furthermore, about 130 million people have only access to drinking water containing more than 10 g As/L.

[Profiles of people who return unused medicine to pharmacies in Puy-de-Dôme, and their motivations for doing so].

An unused drug (U.D.) is described as a drug which is purchased, whether according to a prescription or not, but which is not taken.

[Description of unused drugs collected in pharmacies in the Puy-de-Dôme region in France].

Background: An unused drug (UD) is defined as a drug which is purchased, after prescription or not, but which is not taken. Public health campaigns in France have requested people to return these drugs to their pharmacy. To data, few data have been available concerning the quantity of collected UD and their potential re-use.