function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Niedbała, W.', 2],
    ['Niedbała, W. & Starý, J.', 1],
    ['Niedbała, Wojciech', 7],
    ['Niedbała, Wojciech & Ermilov, Sergey G.', 1],
    ['Niedbała, Wojciech & Illig, Jens', 1],
    ['Niedbała, Wojciech & Liu, Dong', 3],
    ['Niedbała, Wojciech & Starý, Josef', 8],
    ['Oliveira, Anibal R. & Argolo, Poliane S. & De, Gilberto J.', 10],
    ['Revelo-Tobar, Harol', 3],
    ['Revelo-Tobar, Harol & Ojeda, Margarita', 4]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=40)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 10, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);