Results 321 to 330 of about 1,473,678 (357)
Some of the next articles are maybe not open access.

Observational studies

2021
Mendel Suchmacher, Mauro Geller
openaire   +1 more source

Observational Study Designs

Headache: The Journal of Head and Face Pain, 2019
Dana P, Turner, Timothy T, Houle
openaire   +2 more sources

Reporting observational studies

BJOG: An International Journal of Obstetrics & Gynaecology, 1989
openaire   +2 more sources

Observational Studies

2007
Sana Loue, Earl C. Pike
openaire   +2 more sources

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