According to the phs, a "significant financial interest" includes royalty income paid to an investigator and its disclosure is required:

According to the PHS, the term "significant financial interest" includes royalty income paid to an investigator except if that income is from the investigator's current employing institution.

explanation:

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.