Some researchers have pointed out that improvements in basic living conditions, i.e., refrigeration, availability of clean food and water, and sanitation have been responsible for most increases in health in this century.
(Some researchers; have pointed out; that improvements in basic living conditions, i.e., refrigeration, availability of clean food and water, and sanitation have been responsible for most increases in health in this century)
Some researchers
have pointed out
that improvements in basic living conditions, i.e., refrigeration, availability of clean food and water, and sanitation have been responsible for most increases in health in this century