function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Aliyev, Azer & Maharramova, Sheyda', 2],
    ['Broad, Gavin R.', 12],
    ['Gauld, Ian D. & Fernández-Triana, José L.', 1],
    ['Ghahari, H. & Schwarz, M.', 1],
    ['Khalaim, Andrey I. & Kasparyan, Dmitri R.', 1],
    ['Kolarov, J.', 4],
    ['Kolarov, J. & Çalmasur, Ö.', 2],
    ['Moreno, Alejandra González - & Bordera, Santiago', 1],
    ['Riedel & Pénigot & Schwarz & Diller & Johansson & Japoshvili, G.', 6],
    ['Riedel, Matthias & Diller, Erich & Japoshvili, George', 2],
    ['Varga, O.', 4],
    ['Varga, Oleksandr', 5],
    ['Çoruh, S. & Özbek, H.', 3]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=44)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 13, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);