Reference population
The reference population consisted of older people (60 years or more) who visited the primary healthcare centers from two Albanian cities (Shkoder and Tirana), during the period from September 1, 2018 to October 31, 2018 (Shkoder) and from April 1, 2019 to May 31, 2019 (Tirane). These centers belongs to the National Health Service, serving respectively the Shkoder region area population of 204.994 people (about 13.939 older than 65 years old) (6) and the Tirana region area population of 852.673 people (about 110.049 older than 65 years old).