function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Blackburn, T. & Sharp, David', 3],
    ['Blackburn, Thomas & Sharp, David', 1],
    ['Horn, George H.', 1],
    ['Leivas, Fernando W. T. & Mise, Kleber M. & Almeida, Lúcia M.', 2],
    ['Majka, Christopher', 1],
    ['Penati, Fabio', 1],
    ['Peschel, Rüdiger', 1],
    ['Stefanelli, Silvia & Della Rocca, Francesca & Bogliani, Giuseppe', 2],
    ['Yelamos, Tomas', 19]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=31)',
    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);