Talvez deva tentar algumas variações de ortografia:
elderly comparison » elderly compared (Expandir a Pesquisa)
male elderly » female elderly (Expandir a Pesquisa), care elderly (Expandir a Pesquisa), ill elderly (Expandir a Pesquisa)
comparison a » comparison _ (Expandir a Pesquisa), comparison among (Expandir a Pesquisa), comparison based (Expandir a Pesquisa)
nasal tumors » nasal tumours (Expandir a Pesquisa), nasal tumor (Expandir a Pesquisa), nasal tumour (Expandir a Pesquisa)
gomez colin » gomez corina (Expandir a Pesquisa), gomez celine (Expandir a Pesquisa), gomez codina (Expandir a Pesquisa)
tumors dan » tumors da (Expandir a Pesquisa), tumors data (Expandir a Pesquisa), tumors down (Expandir a Pesquisa)
colin new » coli new (Expandir a Pesquisa), colic new (Expandir a Pesquisa), colon new (Expandir a Pesquisa)
dan ning » yan ning (Expandir a Pesquisa), han ning (Expandir a Pesquisa), tan ning (Expandir a Pesquisa)
3 nasal » 3d nasal (Expandir a Pesquisa), 31 nasal (Expandir a Pesquisa), _ nasal (Expandir a Pesquisa)
a non » _ non (Expandir a Pesquisa)

You can also try:

• Europeana
• Digital Public Library of America
• CORE

Pode obter mais resultados ajustando a pesquisa.

• Performing a fuzzy search may retrieve terms with similar spellings: (( j l gomez colin new ) or ((( male elderly comparison a non ) or ( 3 nasal tumors dan ning ))))~.
• Se usar operadores Booleanos, por favor insira-os com letras MAIÚSCULAS: (( j l gomez colin new ) OR ((( male elderly comparison a non ) OR ( 3 nasal tumors dan ning )))).
• Se adicionar um carácter universal pode recuperar variações da palavra pesquisada: (( j l gomez colin new ) or ((( male elderly comparison a non ) or ( 3 nasal tumors dan ning ))))*.