We used gridded tree counts on aerial photographs and satellite images to estimate forest change between 1970 and 2007, and we tested several possible causes of change on the basis of original socio-economic field surveys and climatic and topographic data.
Officials at the state health department declined to comment on possible causes of the outbreak, citing its policy on investigations in progress.
The question on possible causes of mental illnesses allowed respondents to endorse more than one cause.
In this paper an analysis of possible causes of crack occurrence on reconstructed diesel multiple units (DMU) exploited on sideline in Serbia was performed.
Officials at Spanair declined to comment on possible causes of the tragedy, saying it was too soon to speculate.
In fact, an editorial in The New England Journal of Medicine in December 1981 on possible causes of AIDS omitted the whole idea that AIDS might be caused by a previously unknown infectious agent.
It added: BP's report is far from the final word on possible causes of the explosion, as several divisions of the U.S. government, including the Justice Department, Coast Guard and Bureau of Ocean Energy Management, Regulation and Enforcement, are also investigating.
And in the ignition case, he said, the company's position is that there were many possible causes of cars stalling on the road beyond problems with the ignition module.
17While there has been much work on possible causes of such productivity differences (e.g., see Acemoglu 1996; Glaeser and Mare 2001, and other work on agglomeration), we are agnostic here about the source of this variation.
