Special Case: Table with multiple separated header lines

[creisle]

Examples from here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3704624/

Mutations detected in samples.

BRAFV600 (Sanger)	Melanoma (n=45)	Associated nevus (n=46)	Control nevus (n=25)	Matched melanoma (n=28)
V600E	51.1% (n=23)	63.0% (n=29)	52.0% (n=13)	39.3% (n=11)
V600K	0	0	4.0% (n=1)	0
Wildtype	48.9% (n=22)	37.0% (n=17)	44.0% (n=11)	60.7% (n=17)
BRAFV600E (Sanger + VE1 IHC)	Melanoma (n=46)	Associated nevus (n=46)	Control nevus (n=25)	Matched melanoma (n=29)
V600E	63.0% (n=29)	65.2% (n=30)	54.2% (n=13)	41.4% (n=12)
Wildtype	37.0% (n=17)	34.8% (n=16)	48.0% (n=12)	58.6% (n=17)
NRAS Exon 2 (Sanger)	Melanoma (n=42)	Associated nevus (n=44)	Control nevus (n=21)	Matched melanoma (n=26)
Silent mutations	2.4% (n=1; A66A)	2.3% (n=1; L52L)	0	0
Q61K	4.8% (n=2)	4.5% (n=2)	14.3% (n=3)	0
Q61L	2.4% (n=1)	2.3% (n=1)	0	0
Q61R	2.4% (n=1)	9.1% (n=4)	0	7.7% (n=2)
Wildtype	88.1% (n=37)	81.8% (n=36)	85.7% (n=18)	92.3% (n=24)

This should really be 3 separate tables so I'm not sure how we can parse this properly. Right now it assumes anything in the tbody isn't a header

[creisle]

Source XML

<table frame="hsides" rules="groups">
            <colgroup span="1">
              <col span="1"/>
              <col span="1"/>
              <col span="1"/>
              <col span="1"/>
              <col span="1"/>
            </colgroup>
            <thead>
              <tr>
                <th rowspan="1" colspan="1">
<bold>BRAF<sup>V600</sup> (Sanger)</bold>
</th>
                <th rowspan="1" colspan="1">
<bold>Melanoma (n=45)</bold>
</th>
                <th rowspan="1" colspan="1">
<bold>Associated nevus (n=46)</bold>
</th>
                <th rowspan="1" colspan="1">
<bold>Control nevus (n=25)</bold>
</th>
                <th rowspan="1" colspan="1">
<bold>Matched melanoma (n=28)</bold>
</th>
              </tr>
            </thead>
            <tbody>
              <tr>
                <td rowspan="1" colspan="1">V600E</td>
                <td rowspan="1" colspan="1">51.1% (n=23)</td>
                <td rowspan="1" colspan="1">63.0% (n=29)</td>
                <td rowspan="1" colspan="1">52.0% (n=13)</td>
                <td rowspan="1" colspan="1">39.3% (n=11)</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">V600K</td>
                <td rowspan="1" colspan="1">0</td>
                <td rowspan="1" colspan="1">0</td>
                <td rowspan="1" colspan="1">4.0% (n=1)</td>
                <td rowspan="1" colspan="1">0</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Wildtype</td>
                <td rowspan="1" colspan="1">48.9% (n=22)</td>
                <td rowspan="1" colspan="1">37.0% (n=17)</td>
                <td rowspan="1" colspan="1">44.0% (n=11)</td>
                <td rowspan="1" colspan="1">60.7% (n=17)</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">
<bold>BRAF<sup>V600E</sup> (Sanger + VE1 IHC)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Melanoma (n=46)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Associated nevus (n=46)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Control nevus (n=25)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Matched melanoma (n=29)</bold>
</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">V600E</td>
                <td rowspan="1" colspan="1">63.0% (n=29)</td>
                <td rowspan="1" colspan="1">65.2% (n=30)</td>
                <td rowspan="1" colspan="1">54.2% (n=13)</td>
                <td rowspan="1" colspan="1">41.4% (n=12)</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Wildtype</td>
                <td rowspan="1" colspan="1">37.0% (n=17)</td>
                <td rowspan="1" colspan="1">34.8% (n=16)</td>
                <td rowspan="1" colspan="1">48.0% (n=12)</td>
                <td rowspan="1" colspan="1">58.6% (n=17)</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">
<bold>NRAS Exon 2 (Sanger)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Melanoma (n=42)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Associated nevus (n=44)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Control nevus (n=21)</bold>
</td>
                <td rowspan="1" colspan="1">
<bold>Matched melanoma (n=26)</bold>
</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Silent mutations</td>
                <td rowspan="1" colspan="1">2.4% (n=1; A66A)</td>
                <td rowspan="1" colspan="1">2.3% (n=1; L52L)</td>
                <td rowspan="1" colspan="1">0</td>
                <td rowspan="1" colspan="1">0</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Q61K</td>
                <td rowspan="1" colspan="1">4.8% (n=2)</td>
                <td rowspan="1" colspan="1">4.5% (n=2)</td>
                <td rowspan="1" colspan="1">14.3% (n=3)</td>
                <td rowspan="1" colspan="1">0</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Q61L</td>
                <td rowspan="1" colspan="1">2.4% (n=1)</td>
                <td rowspan="1" colspan="1">2.3% (n=1)</td>
                <td rowspan="1" colspan="1">0</td>
                <td rowspan="1" colspan="1">0</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Q61R</td>
                <td rowspan="1" colspan="1">2.4% (n=1)</td>
                <td rowspan="1" colspan="1">9.1% (n=4)</td>
                <td rowspan="1" colspan="1">0</td>
                <td rowspan="1" colspan="1">7.7% (n=2)</td>
              </tr>
              <tr>
                <td rowspan="1" colspan="1">Wildtype</td>
                <td rowspan="1" colspan="1">88.1% (n=37)</td>
                <td rowspan="1" colspan="1">81.8% (n=36)</td>
                <td rowspan="1" colspan="1">85.7% (n=18)</td>
                <td rowspan="1" colspan="1">92.3% (n=24)</td>
              </tr>
            </tbody>
          </table>

[creisle]

Seems like the table is just a weird format, even in the original non-PMC article. I will leave this for now but I am documenting it here in case we run into another case, then we may want to come up with a possible solution