According to the Centers for Disease Control and Prevention, the prevalence of use of e-cigs increased 9-fold—from 1.5% to 13.4%—among high school students between 2011 and 2014, and now exceeds…
Mahmoud H. Al-JohaniApril 6, 2016
Greeting Dr. Periodontal diseases are progressive bacterial infections that may lead to tooth loss because of extensive destruction of alveolar bone. Â The aim of the study is to evaluate the…
Mahmoud H. Al-JohaniMarch 19, 2016
The level of measurement refers to the relationship among the values that are assigned to the attributes for a variable. There are typically four levels of measurement that are defined:…
Mahmoud H. Al-JohaniJanuary 30, 2016