Erro nas referências quando title está entre duplas chaves e contem subtítulo

[edusantana]

Comportamento esperado:

@article{Patton2009,
author = {Patton, George C and Coffey, Carolyn and Sawyer, Susan M and Viner, Russell M and Haller, Dagmar M and Bose, Krishna and Vos, Theo and Ferguson, Jane and Mathers, Colin D},
doi = {10.1016/S0140-6736(09)60741-8},
file = {:home/andresimi/Documentos/Dropbox/Sincronizar/Mendeley Desktop/pdf/Patton et al. - 2009 - Global patterns of mortality in young people a systematic analysis of population health data.pdf:pdf},
journal = {Lancet},
keywords = {infancy,suicide},
mendeley-tags = {infancy,suicide},
number = {9693},
pages = {881--92},
pmid = {19748397},
title = {Global patterns of mortality in young people},
subtitle = {a systematic analysis of population health data}
url = {http://www.ncbi.nlm.nih.gov/pubmed/19748397},
volume = {374},
year = {2009}
}

Passos para reprodução:

@article{Patton2009,
author = {Patton, George C and Coffey, Carolyn and Sawyer, Susan M and Viner, Russell M and Haller, Dagmar M and Bose, Krishna and Vos, Theo and Ferguson, Jane and Mathers, Colin D},
doi = {10.1016/S0140-6736(09)60741-8},
file = {:home/andresimi/Documentos/Dropbox/Sincronizar/Mendeley Desktop/pdf/Patton et al. - 2009 - Global patterns of mortality in young people a systematic analysis of population health data.pdf:pdf},
journal = {Lancet},
keywords = {infancy,suicide},
mendeley-tags = {infancy,suicide},
number = {9693},
pages = {881--92},
pmid = {19748397},
title = {{Global patterns of mortality in young people: a systematic analysis of population health data}},
url = {http://www.ncbi.nlm.nih.gov/pubmed/19748397},
volume = {374},
year = {2009}
}

Especificações do sistema: limarka 0.6.2