I’m just wondering if, during this short time, they monitored other external factors - like water supply, food intake and source, medicines taken, a whole plethora of things. Examine the source of the money, and you’ll have your answer.
Found some work of his and another researcher released in March of this year. “Evaluation and Medical Management of Kidney Stones in Children”.
It has a lot of specifics about chemical makeup of the stones and the distribution of compounds, but it says that more study is needed [the standard “go to” conclusion in most any externally funded research paper].
Frankly, making this leap of mean temperature vs. cities and occurrences of kidney stones, etc. seems just too convenient for the Global Warming alarmists. I’m thinking this is more Poli-Med science than medicine, myself.