function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Balzan, L.', 3],
    ['Banks, Nathan', 2],
    ['Beier, Max', 2],
    ['Chamberlin, Joseph Conrad', 2],
    ['Daday, E. von', 1],
    ['Ellingsen, Edvard', 3],
    ['Mau, Sofía Amieva & Harvey, Mark S. & Harms, Danilo', 4],
    ['Redikorzev, V.', 2],
    ['Romero-Ortiz, Catalina & García, Fabian & Villarreal, Eduardo', 3],
    ['Tullgren, Albert', 1],
    ['Vachon, Max', 1],
    ['With, Carl Johannes', 1],
    ['de Mello-Leitão, Cândido Firmino', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=26)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);