I read on techtransfer.harvard.edu:
In the United States, patent applications may be filed up to one year after an invention's first public disclosure. In contrast, most foreign countries require that patent applications be filed before any public disclosure of an invention. Despite these strict rules, if a U.S. patent application is filed before any public disclosure, most foreign countries permit filing of corresponding applications for up to one year after the U.S. filing date, even if a disclosure of the invention was made after the U.S. filing. Therefore, a U.S. patent application filing prior to any publication or oral disclosure preserves both U.S. and foreign patent rights.
When they write "if a U.S. patent application is filed before any public disclosure", can it be either U.S. patent application or a U.S. provisional patent application?