On covering one's mouth (when yawning)
| Autor: | Dunea, George |
|---|---|
| Zdroj: | BMJ: British Medical Journal, 2004 Apr . 328(7445), 963-963. |
| Databáze: | JSTOR Journals |
| Externí odkaz: |
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| Autor: | Dunea, George |
|---|---|
| Zdroj: | BMJ: British Medical Journal, 2004 Apr . 328(7445), 963-963. |
| Databáze: | JSTOR Journals |
| Externí odkaz: |
|