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<front>
<journal-meta>
<journal-id>0034-7523</journal-id>
<journal-title><![CDATA[Revista Cubana de Medicina]]></journal-title>
<abbrev-journal-title><![CDATA[Rev cubana med]]></abbrev-journal-title>
<issn>0034-7523</issn>
<publisher>
<publisher-name><![CDATA[Centro Nacional de Información de Ciencias MédicasEditorial Ciencias Médicas]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-75232021000400005</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Consideraciones acerca de la verdadera investigación observacional ambispectiva]]></article-title>
<article-title xml:lang="en"><![CDATA[Considerations about true ambispective observational research]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tamargo Barbeito]]></surname>
<given-names><![CDATA[Teddy Osmin]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Quesada Peña]]></surname>
<given-names><![CDATA[Susel]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Hospital Clínico Quirúrgico &#8220;Hermanos Ameijeiras&#8221;  ]]></institution>
<addr-line><![CDATA[ La Habana]]></addr-line>
<country>Cuba</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2021</year>
</pub-date>
<volume>60</volume>
<numero>4</numero>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S0034-75232021000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S0034-75232021000400005&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S0034-75232021000400005&amp;lng=en&amp;nrm=iso"></self-uri></article-meta>
</front><back>
<ref-list>
<ref id="B1">
<label>1</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Veiga de Cabo]]></surname>
<given-names><![CDATA[J]]></given-names>
</name>
<name>
<surname><![CDATA[De la Fuente Díez]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Zimmermann Verdejo]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Modelos de estudios en investigación aplicada: conceptos y criterios para el diseño]]></article-title>
<source><![CDATA[Med Segur Trab]]></source>
<year>2008</year>
<volume>54</volume>
<numero>210</numero>
<issue>210</issue>
<page-range>81-8</page-range></nlm-citation>
</ref>
<ref id="B2">
<label>2</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Hernández Avila]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Garrido Latorre]]></surname>
<given-names><![CDATA[F]]></given-names>
</name>
<name>
<surname><![CDATA[López Moreno]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Diseño de estudios epidemiológicos]]></article-title>
<source><![CDATA[Salud Pública de México]]></source>
<year>2000</year>
<volume>42</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>144-54</page-range></nlm-citation>
</ref>
<ref id="B3">
<label>3</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Fajardo Gutiérrez]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Medición en epidemiología: prevalencia, incidencia, riesgo, medidas de impacto]]></article-title>
<source><![CDATA[Rev Alerg Mex]]></source>
<year>2017</year>
<volume>64</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>109-20</page-range></nlm-citation>
</ref>
<ref id="B4">
<label>4</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Manterola]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Otzen]]></surname>
<given-names><![CDATA[T]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudios observacionales. Los diseños utilizados con mayor frecuencia en investigación clínica]]></article-title>
<source><![CDATA[Int. Morphol J]]></source>
<year>2014</year>
<volume>32</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>634-45</page-range></nlm-citation>
</ref>
<ref id="B5">
<label>5</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Pérez Mamani]]></surname>
<given-names><![CDATA[JI]]></given-names>
</name>
<name>
<surname><![CDATA[Bustamante Cabrera]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudio de cohortes]]></article-title>
<source><![CDATA[Revista de Actualización Clínica]]></source>
<year>2013</year>
<volume>33</volume>
<page-range>1685-9</page-range></nlm-citation>
</ref>
<ref id="B6">
<label>6</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lazcano Ponce]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Fernández]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Salazar Martínez]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández Avila]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudios de cohorte. Metodología, sesgos y aplicación]]></article-title>
<source><![CDATA[Salud Pública de México]]></source>
<year>2000</year>
<volume>42</volume>
<numero>3</numero>
<issue>3</issue>
<page-range>230-41</page-range></nlm-citation>
</ref>
<ref id="B7">
<label>7</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Lazcano Ponce]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Salazar Martínez]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Hernández Avila]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudios epidemiológicos de casos y controles. Fundamento teórico, variantes y aplicaciones]]></article-title>
<source><![CDATA[Salud pública de México]]></source>
<year>2001</year>
<volume>43</volume>
<numero>2</numero>
<issue>2</issue>
<page-range>135-50</page-range></nlm-citation>
</ref>
<ref id="B8">
<label>8</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[González Garay]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[Díaz García]]></surname>
<given-names><![CDATA[L]]></given-names>
</name>
<name>
<surname><![CDATA[Chiharu Murata]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Anzo Osorio]]></surname>
<given-names><![CDATA[A]]></given-names>
</name>
<name>
<surname><![CDATA[García de la Puente]]></surname>
<given-names><![CDATA[S]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Generalidades de los estudios de casos y controles]]></article-title>
<source><![CDATA[Acta Pediatr Mex]]></source>
<year>2018</year>
<volume>39</volume>
<numero>1</numero>
<issue>1</issue>
<page-range>72-80</page-range></nlm-citation>
</ref>
<ref id="B9">
<label>9</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Solís Sánchez]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
<name>
<surname><![CDATA[Orejas Rodríguez Arango]]></surname>
<given-names><![CDATA[G]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Epidemiología y metodología científica aplicada a la Pediatría (II): Diseños en investigación epidemiológica]]></article-title>
<source><![CDATA[An Esp Pediatr]]></source>
<year>1998</year>
<volume>49</volume>
<page-range>527-38</page-range></nlm-citation>
</ref>
<ref id="B10">
<label>10</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[Molina Arias]]></surname>
<given-names><![CDATA[M]]></given-names>
</name>
<name>
<surname><![CDATA[Ochoa Sangrador]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Fundamentos de Medicina basada en la evidencia. Tipos de estudios epidemiológicos]]></article-title>
<source><![CDATA[Evid Pediatr]]></source>
<year>2013</year>
<volume>9</volume>
<page-range>53</page-range></nlm-citation>
</ref>
<ref id="B11">
<label>11</label><nlm-citation citation-type="journal">
<person-group person-group-type="author">
<name>
<surname><![CDATA[García]]></surname>
<given-names><![CDATA[N]]></given-names>
</name>
<name>
<surname><![CDATA[Manterola]]></surname>
<given-names><![CDATA[C]]></given-names>
</name>
<name>
<surname><![CDATA[Guerrero]]></surname>
<given-names><![CDATA[E]]></given-names>
</name>
<name>
<surname><![CDATA[Navarrete]]></surname>
<given-names><![CDATA[O]]></given-names>
</name>
</person-group>
<article-title xml:lang=""><![CDATA[Estudios de cohortes especiales]]></article-title>
<source><![CDATA[Rev. Cirugía]]></source>
<year>2020</year>
<volume>72</volume>
<numero>2</numero>
<issue>2</issue>
</nlm-citation>
</ref>
</ref-list>
</back>
</article>
