function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Fabricius, Johann Christian', 1],
    ['Mathis, Wayne Neilsen & Júnior, Francisco De Assis Rodrigues', 2],
    ['Michelsen, Verner & O’Hara, James E.', 1],
    ['Pont, Adrian C.', 1],
    ['Sforzi, Alessandra & Sommaggio, Daniele', 1],
    ['V, Marco', 1],
    ['Wendt, Lisiane Dilli & Ale-Rocha, Rosaly', 1],
    ['Šifner, František', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);