The Integrated Use of Heavy-Metal Pollution Indices and the Assessment of Metallic Health Risks in the Phreatic Groundwater Aquifer—The Case of the Oued Souf Valley in Algeria oleh Ayoub Barkat, Foued Bouaicha, Sabrina Ziad, Tamás Mester, Zsófi Sajtos, Dániel Balla, Islam Makhloufi, György Szabó