function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Bird, Graham J', 4],
    ['Chim, C. K. & Tong, Samantha J. W.', 2],
    ['García-Herrero, Álvaro & Esquete, Patricia & Cunha, Marina R.', 1],
    ['Guerrero-Kommritz, Jürgen', 1],
    ['Guerrero-Kommritz, Jürgen & Schmidt, Anja & Brandt, Angelika', 3],
    ['Jóźwiak, Piotr & Błażewicz-Paszkowycz, Magdalena', 2],
    ['Larsen, Kim', 2],
    ['Larsen, Kim & Bird, Graham & Ota, Mayumi', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=18)',
    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);