function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Boonyanusith, Chaichat & Wongkamhaeng, Koraon', 1],
    ['Gomez, Samuel & Yanez-Rivera, Beatriz', 1],
    ['Gómez, S. & Gee, J. Michael', 4],
    ['Gómez, S. & Scheihing, R. & Labarca, P.', 1],
    ['Gómez, Samuel', 3],
    ['Gómez, Samuel & Gerber, Ray & Fuentes-Reinés, Juan Manuel', 4],
    ['Suárez-Morales, Eduardo & Barrera, O. & Ciros-Pérez, J.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=15)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);