function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barranco, P. & Mayoral, J. G.', 1],
    ['Börner, Carl', 1],
    ['Condé, Bruno', 1],
    ['Grassi, B. & Calandruccio, S.', 1],
    ['Hansen, Hans Jacob', 7],
    ['Peyerimhoff, P.', 2],
    ['Rucker, A.', 3],
    ['Silvestri, Filippo', 2],
    ['de Mello-Leitão, Cândido Firmino & Arlé, R.', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=19)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 9, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);