Paper  bibtex   

@misc{us_national_library_of_medicine_clinicaltrialsgov_2020,
	title = {{ClinicalTrials}.gov},
	url = {https://clinicaltrials.gov/},
	language = {en},
	urldate = {2020-07-20},
	journal = {https://clinicaltrials.gov/ct2/home},
	author = {US National Library of Medicine},
	month = jul,
	year = {2020},
	note = {Library Catalog: clinicaltrials.gov},
}