Cognitive impairment in a primary healthcare population: a cross-sectional study on the island of Crete, Greece oleh Panagiotis Simos, Simeon Panagiotakis, Joanna Moschandreas, Dimitrios Boumpas, Antonios Konstantinos Bertsias, Sophia Papadakis, Ioannis Zaganas, George Duijker, Emmanouil K Symvoulakis, Polyvios Papadokostakis, Kornilia Makri, Eliza Iatraki, Chariklia Tziraki, Maria Basta, Alexandros Vgontzas, Christos Lionis