@article{ref1,
title="Comments on Hynes et al. Prevalence of marijuana use among university students in Bolivia, Colombia, Ecuador and Peru. Int. J. Environ. Res. Public Health 2015, 12, 5233-5240",
journal="International journal of environmental research and public health",
year="2015",
author="Martinez-Novack, Maria Claudia and Ortiz-Ortiz, Maria Teresa and Castañeda-Carbajal, Bruno and Alvarado, German F.",
volume="12",
number="9",
pages="11718-11720",
abstract="We have read and analyzed the article entitled &quot;Prevalence of marijuana use among university students in Bolivia, Colombia, Ecuador and Peru&quot;. We propose some objective points which could enhance the internal validity of the study (i.e., we suggest to report participation proportions)...<p /> <p>Language: en</p>",
language="en",
issn="1661-7827",
doi="10.3390/ijerph120911718",
url="http://dx.doi.org/10.3390/ijerph120911718"
}