function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Artal, Pedro & Van Bakel, Barry W. M. & Fraaije, René H. B.', 3],
    ['Bogan, Sergio & Agnolin, Federico & Ezcurra, Martín D.', 1],
    ['Brösing, Andreas', 1],
    ['GUINOT, DANIÈLE & TAVARES, MARCOS & CASTRO, PETER', 1],
    ['Gašparič, Rok & Hyžný, Matúš & Jovanović, Gordana', 1],
    ['Nyborg, Torrey & Vega, Francisco J. & Filkorn, Harry F.', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=9)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);